Quick Tip: What Is AR-15 "Dwell Time"?

Рет қаралды 51,506

2 жыл бұрын

Brownells Gun Tech™ Caleb Savant dwells on a topic that's important when you're diagnosing a cycling malfunction on an AR-15 or choosing the gas system for a new AR-15 build: dwell time. "Dwell time" is the amount of time the combustion gases from the fired cartridge act on your AR-15's operating system. When you fire a round, the bullet is propelled down the bore by hot gas. After it passes the gas port, some of the gas escapes through the gas block into the gas tube, which takes that gas back to operate the bolt-carrier and cycle the action. If you web search "AR-15 dwell time," you'll get a lot of hits on a different answer, and Caleb explains why it's not entirely accurate.
You'd need ultra-high-speed laboratory instruments to measure actual dwell time, so a simple indicator of dwell time is GAS SYSTEM LENGTH (the distance from the chamber to the gas block). Different gas system lengths provide different dwell times. Shortest to longest, the standard AR-15 gas system lengths are Pistol (about 4.5"), Carbine (~7"), Mid-Length (~9"), and Rifle (~12"). For example, if you have two 16" barrels, one with a Carbine-Length gas system and the other with a Mid-Length, which one has the longer dwell time? Write down your answer and see if it matches Caleb's answer! Also, the closer the gas port is to the chamber, the higher the pressure of the gas that hits the gas tube. The farther the bullet travels down the barrel, the less gas pressure behind it. So a Pistol-Length gas system generates substantially MORE pressure than the much longer Rifle-Length system.
The Big Takeaway: DWELL TIME is the total amount of time the GAS pressure from a fired cartridge acts on an AR-15's operating system.

Пікірлер: 254

@RARufus 2 жыл бұрын

These series are very helpful. Even as a refresher for folks who already know most of it…or think they know it. 🙂

@willnotcomply1328 2 жыл бұрын

Best and most informative channel for DIY gunners like myself, bar none! Thanks Caleb, and thanks Brownells!

@greggminkoff6733 2 жыл бұрын

I'm a retired machinist and have worked on my pistols and rifles my whole life. Every problem that can cause a misfeed of any kind can be grouped into one category, TIMING. It doesn't matter what you call it, the timing of the mechanics have changed. 99% of the time this change is due to contamination of the moving parts or DIRT. It doesn't matter if it is actual soil or powder residue. The minute that any friction point is increased that's where the change in the function of the firearm happens. A good cleaning and lubrication and the removal of any interference will restore your firearm into its original working condition. It's just that simple. Clean your weapon!!!

@Iceaxehikes 2 жыл бұрын

After Caleb works on your AR it comes home wearing a bowtie.

@rookshaw4974 2 жыл бұрын

If it's formal. Bolo tie, if it's feeling casual

@STEVEARABIA1 2 жыл бұрын

And slicked back hair.

@rookshaw4974 2 жыл бұрын

Chad status

@LUR1FAX 2 жыл бұрын

@@STEVEARABIA1 Question: Can you use oil-based hair pomades as lubricant for firearms? I don't expect you can use water based pomades for this, but what about oil based ones?

@ilikewesties2753 2 жыл бұрын

it will be sweet and funny if it does

@kirksmith347 2 жыл бұрын

Caleb made a video without a cup of coffee? who is this imposter...?

@bunnyoperator 2 жыл бұрын

It is good to have this technical definition of the term, and even noting that the common use variant is also "correct" for visual explanation. This seems to provide clarity for folks who want the knowledge expansion and it's appreciated. Just one piece of the puzzle, folks. No need to get all flustered over it.

@whatsmolly5741 2 жыл бұрын

This isn't exactly the kind of hobby where you can simply go down the list and check all the boxes and as long as you follow the rules you will be ok, this is the kind of hobby where it is critical you understand exactly why you're doing something and how it effects the system as a whole.

@MrJerry160 2 жыл бұрын

Thanks for the morning upload. I am learning gun technicalities on the toilet seat.

@petemarkle1083 2 жыл бұрын

I can't think of Brownells now without think'n Nerdery!. Appreciate the info..

@BikerDash 2 жыл бұрын

This is one of those videos that I wish KZfaq offered a ❤️ button alongside the thumb up button for. I absolutely love these technical vids because they get down to the nitty-gritty details of what goes on. As a follow-up to this, maybe a discussion on how adjustable gas blocks work and how they can help or hurt how reliably the gun functions.

@berjo77 2 жыл бұрын

Very good, highly useful production! After 10 years of Army armorer’s instructions either going over my head, or just not clicking, it’s very nice to finally understand this. Great job, much appreciated!

@A-PatrioT 2 жыл бұрын

This explains why Pistol and Carbine length Gas systems does much better with cycling Steel Cased ammo.

@michaelbrininstool4515 2 жыл бұрын

My rifle length gas system has no trouble with steel cases. So I guess I am lucky.

@ZenoLycurgus 2 жыл бұрын

i believes these guys more than everybody else. this is way i subscribed

@donhinkle3693 2 жыл бұрын

As my PawPaw used to say "Knowing and not knowing too , I'd really hate to say either way" 👍🏼

@RF_GT3 Жыл бұрын

Thank u for this video. I was dying to make my 16in 556 into a “dissipator” or even use an intermediate gas length. But now i realize that a mid length gas system is the perfect option with an AGB. No point to risk the dwell time being too low with an intermediate or rifle length gas system on a 16in.

@mopardoctor9966 2 жыл бұрын

When shooting the 6.5 Grendel with a 22” or 24” barrel you can get what is called “belted” cases when the cases are being extracted while the pressure is too high. The case gets ballooned out and looks like a belt on a magnum cartridge. Proper powder selection will prevent this from happening. This is due to excessive dwell time on gas guns and fast powders.

@walterkleban2746 2 жыл бұрын

The pressure behind the bullet decreases because the bore volume increases as the bullet moves forward in the bore. When first fired the gas volume is essentially the cartridge case volume. As the bullet moves forward the volume behind it increases rapidly decreasing the pressure faster than the burning powder can increase it.

@jthrelf 2 жыл бұрын

PV = nRT ;)

@walterkleban2746 2 жыл бұрын

@@jthrelf another engineer.

@vannigiovannigio8861 Жыл бұрын

Such a thorough examination. Thank you Brownells for these educational videos.

@patrickdaly5068 2 жыл бұрын

Thanks for this video! It was very informative as always. You’ve helped me understand how these firearms work. I had never heard this term so I learned something new.

@chribu5454 2 жыл бұрын

Thanks for taking the time to make these. I always leave informed 👍

@jonesy2234 2 жыл бұрын

Great video as always thank you for all you do!

@SouthOfSanity79 2 жыл бұрын

I picked up a Sig Sauer m400. Like the original not the tread or the snake bite. Anyway.. very first AR-15 I've ever owned. I'm 42 years old. Took long enough. I would like to say thank you to everybody at this channel. I've learned a lot from you folks and I really appreciate that. When I got my AR-15 like I knew how to load it I knew how to chamber around payment and fire it. I didn't even know how to clean it properly and I mean I've owned guns my entire life. Just never an AR-15 and then we know and AR-15s parts and whatnot move a little bit different than shotguns, pistols, bolt action rifles etc. Again.. thank you very very much. There is such a wealth of wonderful and very accurate and useful information on this channel. As always stay safe, keep carrying and God bless 🙏🇺🇸🏴

@quityourfuckincryin 2 жыл бұрын

Thanks

@rottanwelding 2 жыл бұрын

Nerdy is good. Stay that way. WE like it. Thank you.

@stephenrickjr.7519 2 жыл бұрын

Always interesting and useful information, thank you.

@michaelkullas2031 2 жыл бұрын

Learned something new today. Thanks Caleb.

@kubikariYOU 2 жыл бұрын

Great explanation. Well done!

@dtmelanson 6 ай бұрын

Excellent information. Thank you.

@JasonVladimir 2 жыл бұрын

I appreciate the redundancy! Thank you for sharing!

@KO-ih1ld 2 жыл бұрын

Great information, just the kind of 'quick and dirty' info we need (been thinking about changing our my carbine length barrel for a 20 inch with rifle length gas port (I understood the gas tube should change), I'd like to more about the impact (of not change buffer, spring, or bcg...) Thx.

@vikramgupta2326 11 ай бұрын

Excellent explanation and clarification. I've heard other channels get this wrong and say midlength has "more" dwell time.

@bshwin 2 жыл бұрын

Great explanation! Thank you.

@drenk7 2 жыл бұрын

Thanks Caleb for the detailed information 👍

@S1L3NTG4M3R 2 жыл бұрын

THANKS

@lookin420 2 жыл бұрын

We need more of this that’s awesome thank you

@lizzapaolia959 2 жыл бұрын

Great video 😀 my husband and I will be making a purchase soon. God bless all of you.

@jammbbs1688 2 жыл бұрын

Love videos like this wise you guys made lenghtly videos these are wayyyy took short

@MrSabram07 Жыл бұрын

Great, great explanation

@raymondpeterson5748 2 жыл бұрын

Nice explanation

@davidbarham9113 2 жыл бұрын

Great video. Very informative, thank you.

@COIcultist 2 жыл бұрын

So Kaleb said that dwell time wasn't the amount of time the bullet spent in the barrel after reaching the port, but the amount of time that the port gasses acted upon the block? Yet he didn't explain why the two would be different?

@donnieronald3641 2 жыл бұрын

Because you are always trying to solve for a constant. Dwell time is always = the lengths of the barrel after the gas port, but the length of the barrel is a changing variable so we use the constant of “Dwell time”. That probably makes even less sense than when he explained it but that’s just how physics do. Force is always = to mass x acceleration, and even if the mass or acceleration (barrel length after the gas port) change the Force will always be the product of those variables.

@Jonathan906 2 жыл бұрын

That distinction wasn't explained clearly enough for me either.

@chipsterb4946 2 жыл бұрын

@@Jonathan906 me 3. The instant the bullet leaves the barrel, the pressure in the gas system drops to zero. I guess it takes a fraction of a second for the gas pressure inside the BCG to dissipate? No, that’s wrong. Gas pressure in the BCG should drop the instant the BCG moves back far enough for the carrier key to disengage from the gas tube. Also there are the vent holes in the BCG… Caleb has me thinking for sure. And scratching my head.

@1982rrose 2 жыл бұрын

A video on what upgrades contribute the most to accuacy in order of % of improvement. In other words what contribtutes the most to least so what would get a person the greatest increase in accuracy. Barrel, free float, ammo, BCG, trigger, reciever group?

@RARufus 2 жыл бұрын

If your build is solid and the barrel is decent, the ammo has the largest impact on accuracy apart from the shooter, which is the single largest variable. Outside of ammo, the next thing is whether the receiver and barrel extension are true to each other and the quality of the barrel. Apart from that, free floating the barrel will generally provide tighter groups, not not always. You can have a better barrel in a non free floated confit that will group better that a free floated config. If you’re hand loading you can also tune the load to match your specific rifles harmonics too.

@jwilsonhandmadeknives2760 2 жыл бұрын

As far as parts upgrades, AR accuracy is 90% about the barrel, followed by the trigger, then free float. Free float is almost irrelevant if the barrel won’t group and the trigger isn’t consistent. ARs are not bolt guns, and certainly not benchrest guns. Anything you do beyond barrel, trigger, and free float is searching for minuscule improvement, which may or may not be noticeable depending on your ability- and most likely shooting from a bench. How to shoot accurately enough to tell the difference is a lifelong pursuit. Accurate ammo is a given. A national match rifle isn’t going to group with crap ammo.

@machinis 2 жыл бұрын

I'm wondering if a slow-motion camera could capture the dwell time it takes to perform such a slick hair.

@chad9166 2 жыл бұрын

Caleb is a treasure

@adherentofgod Жыл бұрын

We love the nerdy! we need more of this, especially for the ones that love to know the "science" of weapons. Thanks Bro! Keep the "Nerdy".

@stephenwhittier6439 2 жыл бұрын

👍. Thanks again !

@DJJonnyBlaze 2 жыл бұрын

Well put. Not redundant just drove the pont home

@timothystratton2042 2 жыл бұрын

Very well explained

@bigbeaver 2 жыл бұрын

Brownells 1939-2024 RIP...We will miss you !!! Corn by one's onw bushel.

@ericbishop5959 2 жыл бұрын

This is exactly what folks need to hear.

@christo_reese 2 жыл бұрын

Looking forward to more videos like this 👍🏻

@versoarmamentcompany Жыл бұрын

Love this stuff

@joshm3484 2 жыл бұрын

Dwell time = the time gas is acting on the system. The time gas is acting on the system = how long it takes the bullet to go from the gas port to the muzzle. So, dwell time = how long it takes the bullet to go from the gas port to the muzzle. Edit: In a DI AR. In a piston driven action, dwell time will be influenced by the gas release porting of that system.

@trailertrashtactics 2 жыл бұрын

Awesome video per usual!

@03redrubi 2 жыл бұрын

Now I feel all geeked out. Dang I need a shower!

@pewpew703 Жыл бұрын

Finally! Somebody who defines dwelltime the same way I define dwelltime.

@cevant1 Жыл бұрын

It would have been nice if Caleb explained what to do when you have gas problems, for example, use this weight buffer for a carbine length gas system ect.

@ezrabrooks12 2 жыл бұрын

Good Video/Info.

@jorgeavila3885 3 ай бұрын

Is it me the only one that misunderstood? He did say Dwell time is the time the gas takes part in your system (not the time it takes the bullet travel from the barrel gas hole to exit the barrel). check it out 5:12. Please advise Brownells, Inc.

@599Dan Жыл бұрын

Caleb's voice is so soothing it's kind of like Bob Ross but with guns instead

@timhatchett7048 2 жыл бұрын

Great job!!!!!!

@billquillin1952 2 жыл бұрын

Many people confuse Dwell Time with Lock Time.

@sofloflow 2 жыл бұрын

That LWRC BCG 👌

@Rubicon1776 2 жыл бұрын

Completely overlooked the point of why dwell time is important! For reliable case extraction and ejection! More dwell time is better! Longer gas systems produce more dwell time. Gives the malleable brass casing more time to contract after initial expansion from firing

@CalebSavant 2 жыл бұрын

No, more dwell time is not always better, longer gas systems produce a shorter dwell time.

@PlataniumRacer 2 жыл бұрын

Sweet ported barrel

@ryand2529 2 жыл бұрын

If knowing the inner workings of a gun make me nerdy, then I want to be Urkel

@motonut007 2 жыл бұрын

A case of splitting hairs. While your definition is correct and I see it..... I think the general thought a lot of people have is, dwell is the time of positive pressure enacting on the BCG. SO, length from gas port to muzzle is the time you have to make positive pressure. the shorter the distance between gas port to muzzle the less space you have to make that positive gas pressure. So fixing dwell time can get a little "deep end" with diameter of the gas port and adjustable gas blocks, length of gas tubes (seen them wrapped around a barrel before), weight of BCG and buffers to get proper dwell time for proper clearing and ejection.

@khann844 2 жыл бұрын

exactly!

@davidmilisock5200 2 жыл бұрын

And powder burn rate. Which is why the definition is pressure acts on the action, that may not be until the bullet exits the bore.

@lawrencehudson9939 2 жыл бұрын

Ok since there is an interrelationship between dwell time, barrel length, carrier weight/dimensions and recoil buffers and springs, is there a chart that shows this relationship?

@elingeniero9117 2 жыл бұрын

There is a table with four entries on it. It lists how big a hole to drill on the barrel so enough gas is tapped to provide a sufficient pressure pulse for each barrel length to cycle the action. Carbine length have a smaller holes than rifle length barrels because the pressure tapped closer to the breech is higher. In the AR-17 and AK-47 dwell time is determined by how long the bayonet handle you stick on the rifle is. Reciprocating mass and spring rates only matter when talking about full auto rates of fire.

@Jesusprayerwarriorbw 2 жыл бұрын

Calab, wish you had a zoom class to build own AR & AK with Q&A

@crusiethmaximuss 2 жыл бұрын

This is really good information. Reminds me of ignition coils, blow-by, or back-pressure in an engine. So then using a dB lowering suppressor will increase dwell time? Can y'all do a follow-up video with common misdiagnosis and proper diagnosis of dwell time related malfunctions and causes?

@Zel_eo 2 жыл бұрын

A short answer for your suppressor question would be yes, a suppressor can increase dwell time, due to the pressure captured within the suppressor body, but not as much as a longer barrel produces as the gas pressure has more room for expansion within the suppressor body and baffles. As for the issues caused by dwell time, this gets a bit complex as there are three other factors at play within a semi-automatic gas cycled rifle. Along with dwell time/gasblock fitment and alignment you must factor in spring strength, buffer weight, and power of the ammunition you are using. The most I can say is ensure your gasblock is properly aligned using either a tool or the spaghetti trick and then if issues occur you at least know that you have ruled out one factor. Hope this helps!

@crusiethmaximuss 2 жыл бұрын

@@Zel_eo Dude, thank you so much for taking the time out of your day to give me some helpful insight and sharing your knowledge with me. You're a good person. Have a gooder.

@armoredsaint6639 2 жыл бұрын

You know after you fired your first magazine from a fresh build and you sort of have that glowing warm fuzzy feeling and you want a cigarette!…..Dwell time!

@denniscasey986 2 жыл бұрын

Nerdy is good.

@martymonaco1255 2 жыл бұрын

Love the video!! So much that goes into the proper operation of an AR. HEY, CALEB! Now that you mentioned the different gas systems (pistol, carbine, mid-length and rifle), if I were to switch out my upper assembly from a 5.56 to, let's say, a 300 blackout, do I need to be concerned with the gas system? Should the gas system on the 300 blackout be the same as the 5.56? Do I need to also consider the buffer tube? Fascinating! Anybody else have ideas? Thanks, y'all! Keep 'em comin', Caleb!

@nateburns5933 2 жыл бұрын

If you switch from 556 to 300 blackout the gas port that's drilled into the barrel of the 300bo barrel you buy will be the proper size to operate correctly. Gas blocks, gas tubes and gas keys are all standard size(for the most part) no matter the caliber you choose. Where the difference is is actually the size of the hole drilled into the barrel for operating gas to pas through. That being said the gas system length you choose for the caliber you choose will be key to it's optimal operation. I believe the optimal length for 300 is pistol length. I know they have 300 bo barrels with carbine and maybe even mid length gas systems but I am fairly sure the round was designed for pistol length.

@martymonaco1255 2 жыл бұрын

@@nateburns5933 Thank you so much! This is a big help! Thanks for the quick response, too!

@W1ckedRcL 2 жыл бұрын

Dwell time is the amount of time it takes for your bolt carrier group to begin the movement of extraction of a spent cartridge. In other words, the time the BCG 'dwells' in place after a cartridge is discharged. Dwell time is measured in fractions of a second. This is affected by the length of you gas system, the powder load in your ammo, the back pressure of a suppressor, and the weight of your buffer and bolt carrier. All of those factors can be tuned to adjust accuracy, extraction pattern, felt recoil, and wear and tear on your rifle. It can mean the difference between a smoothly and comfortably operating rifle, and regular malfunctions, stuck cartridges, and premature parts failure.

@chrisgabbert658 2 жыл бұрын

The comments will be all over the place on this one 🤷‍♂️👍😁

@algoneby 2 жыл бұрын

Gas related issues frequently come up.

@Chiller01 2 жыл бұрын

Often shortly after a meal.

@jhutch1470 2 жыл бұрын

Mostly on taco Tuesday.

@kimdearrington258 2 жыл бұрын

The description that you just gave that determines dwell time, is the exact time that the bullet passes the gas block, until it exits the barrel tip. Alot of people refer to it as cork time. The amount of time that the gases interact upon the cycling of the gun dies not determine the amount of pressure applied at all times, no, but it does describe the time for which gases are applied to the gas tube, which is the anoint of time that it takes the bullet to pass the gas block, and exit the barrel. You didn't ask what the pressures were along that time, you only asked what dwell time was. Then you went into the specifics of gas pressures, buffers, and spring tentions, which all affect the performance of the gun, but your original question was what is dwell time. The dwell time is the amount of time that the gases enter the gas block, which us when the bullet passes the gas block, until the bullet exists the end of the barrel, period. Do thise pressures vary at the instant tge bullet is fired until it exits the end of the barrel, yes, but the amount of time varies little, which if you wanted to get extremely technical, those times can be affected by the exact amount if powder, bullet weight, temperature, and other factors, but dwell time is the amount if time on average that the bullet spends between the gas block and the end of the barrel, it's that simple! It is also called cork time, and in my opinion is a good descript to what is happening because it corks the barrel and applies the gas to the gasblock, the gas tube, and the bolt carrier and bolt.

@JJGuccione 2 жыл бұрын

Did I understand you - A carbine-length gas-block has more dwell that mid-length of rifle-length? Inversely proportionate, i'e., the shorter the length from the chamber, the longer the dwell.

@CalebSavant 2 жыл бұрын

Yes, Think of it this way, the closer the gas block is to the muzzle, the less time the gas will be pressurized in the firearm.

@JJGuccione 2 жыл бұрын

@@CalebSavant Copy - Thanks

@davidcbrainard 2 жыл бұрын

A question I’ve always had is how much length of barrel past the gas port is required for the action to cycle. For instance, if you cut the barrel length shorter, say for example to SBR a rifle, how short can you cut it past the gas block? Not just for an AR15 but for piston guns as well? To be even more specific, if I wanted to SBR a Mini-14, how short past the gas block can I go and still be functionally reliable?

@scottallen2804 2 жыл бұрын

Good beginning, but how do you affect the dwell time and work with tuning the system. I know that changing cycling includes the buffer tube and spring, but can the buffer tube change things? What about the weight of the GCG? I have an inkling of an idea how these things affect cycling, but that's just it, an inkling. thanks,

@allthingsconsidered3211 2 жыл бұрын

Dwell time is very correlated to gas port to barrel crown. Shorter distances:less dwell time

@ETHRON1 2 жыл бұрын

It's not that different from the "Dwell time" with a set of points on a motor...same basic principle. Good to know "C"...added this to my gun tech Playlist.

@ETHRON1 2 жыл бұрын

FYI... motors used to have point in the distributor and yes I'm old...just wanted to get that out of the way...😏😆😆

@georgesakellaropoulos8162 2 жыл бұрын

Just what I was thinking.

@ETHRON1 2 жыл бұрын

@@georgesakellaropoulos8162 😁...you will be my age someday 😆😆😆

@georgesakellaropoulos8162 2 жыл бұрын

@@ETHRON1 I might already be.

@FDCNC 2 жыл бұрын

You could have explained it using physics. Pressure equals force over area. P=F/a. When the surface area of the barrel increases with length, the force of the gas in the barrel is distributed over a larger area which results in a lower Pressure.

@michaelpeterson1169 2 жыл бұрын

You said that dwell time is “the amount of time that the gas is acting on the system”. So, once the gas unlocks the bolt and the bolt carrier moves back far enough to get the gas key off of the gas tube, the gas is no longer acting on the system. That tells me that a pistol length system has the shortest dwell time, not the longest. Also, the carbine gas system would have a shorter dwell time than a mid-length or a rifle length gas system. I agree that a shorter gas system has a higher pressure than a longer one but, I think that dwell time is directly proportional to the gas system length. Why am I wrong?

@Eyeontheogive 2 жыл бұрын

Pressure curve drops as it occupies space in barrel and gas tube. It’s also dependent on powder burn rate. That’s my take on it!👊👊👍.

@mdk777s6 2 жыл бұрын

@@Eyeontheogive That only further illustrates what Michael Peterson stated.

@Crangaso 2 жыл бұрын

Dapper AF

@whatsmolly5741 2 жыл бұрын

Ok ok let me get this straight Dwell time is the amount of time gas is acting on the system and it is not the amount of time it takes the bullet to go from gas block to leaving the barrel. My problem here is that the gas starts to act on the system as soon as the bullet passes the gas block and it stops acting on the system when the bullet leaves the barrel. *Passing the gas block = gas starts to act on the system. *exiting the barrel = the gas stops acting on the system Therefore dwell time does equal the amount of time it takes to go from gas block to exiting the barrel. It may not be the technical definition but it does infact give you the correct answer. Once you define the points where the gas starts and stops acting on the system both definitions are correct.

@GunsNBBQ 2 жыл бұрын

🤠🤝

@onenikkione 2 жыл бұрын

Use your Right hand when you suggest we smash the like button, YT moved it (again)

@YahLovesYou86 2 жыл бұрын

I can relate, I have a gas related malfunction after eating Taco Bell.

@Paladin1873 2 жыл бұрын

I've heard of looped gas tubes for short barrels that are supposed to simulate carbine gas tubes. Do they really work or offer any real advantages?

@Paladin1873 2 жыл бұрын

@Alex Gessner Sounds reasonable.

@timmsmiithgm557 2 жыл бұрын

So even after the buffer has retracted as far as it's going to go and is starting to move forward, if there is any remaining gas pressure that is causing resistance of that forward movement, it's still considered part of the dwell time? Or, is dwell time just the amount of time until the buffer starts to move forward again?

@iamgermane 2 жыл бұрын

D.I. guns are history!

@wadesmith6908 2 жыл бұрын

Old guys can think of this as ignition timing

@user-ks1oy8fs8c 6 ай бұрын

Hey Newby here. So, how does the port (gas) size and position and buffer weight effect calculating a build to accommodate smooth reliable operation and longevity. And how to calculate that. I.E. small port near chamber vs large port near muzzle. Thanks

@ronniemaeker9102 2 жыл бұрын

Would you address the same "dwell" time for piston operated rifles...?

@davidgaines8607 2 жыл бұрын

The relationship between barrel length, gas system, and the 5.56 cartridge would have been appropriate to talk about here. For example , the ideal setup is a 20" barrel with a rifle length gas and buffer . Everything else is a fix , or work around for a shorter gun.

@jamesmartin7282 2 жыл бұрын

You mentioned ejection angle... how can you use that to diagnose gas problems?

@CalebSavant 2 жыл бұрын

I go into detail on our series we did, check it out on the website, unfortunately I cannot link it for the same reasons it was not allowed on KZfaq.

@keithlewis9106 2 жыл бұрын

Question, if you run a suppressor and sub ammo , can you reduce the bolt carrier weight and spring to get the rifle to cycle ??

@chazdoomy1512 2 жыл бұрын

Going on the basis of what you are saying then why do dissipator like systems not work well? They are pro-ported to have ‘bad’ dwell time based on the lack of gas coming back because the barrel is too short.