Excellent video. And thanks for showing a much easier way to reconnect the trigger bar spring than was shown on the Apex Tactical video.

you have no idea how much this helped/saved me you're the best my guy

I just built my first sig. P320 legion. I must have watched your video over 15 times lol. Awsome work!

Great paint job. This was helpful. Haven’t taken mine down this far yet.

Great video! Could not have built mine without your great help!!

Very helpful, thank you. Getting ready to build one of these from scratch.

Great video. I just installed the Grayguns P320 Competition Trigger kit on my pistol had your videos running in the background for help. Would not have even considered doing it myself before watching this video and the disassembly video. Thank you, thank you, thank you.

Awesome. Very on point!! Thanks for posting!

Honestly. Best video on youtube, with out this step-by-step tear down and rebuild of FCU. I would have punched a wall :)

Excellent video. Thank you so much for what you do. Keep the content coming.

Great video. I bent my safety takedown lever spring. Just waiting on my new one to come in.

I can't tell you how fast I started doing John wick drills after completing this build thank you sir

thank you thank you thank you!!!! you just saved me soo much time and hassle! i was having such a hard time installing the trigger.

Excellent tutorial; thank you!

Great video !

one of the best reassembly videos!!!! Can you post a link where I can get those two tools? Very handy!

Great job. Thanks!

Thanks for a great video. It solves problems I ran into when cleaning my gun. By the way, just a suggestion, when you set up your camera, you might put narrow, colored, tape on the mat around what's showing on the screen. That way, when you're working, you'll know what the boundaries of what the camera will catch are.

Do you have any tips or know of any videos on the "slight modifications" for the JSD MUP-1 frame to accomodate .45acp (instead of the standard 9mm). Thank you. Great video.

You saved my ass buddy. Thanks for the video

Really good video, thanks for putting this info out there. I would love to see you build 80% FCU and put it into a Polymer80 grip module. (liked & sub'd)

spent an hour looking for a sear spring i dropped .. friggen thing was stuck to my pants leg. good video ...it only took me 2 hours to put this mess back together.. at least its all clean now

Some may find it easier, if they have a full set of punches, to use the same size punch as the pin. This allows a smoother push out of the punch with the pin and avoids the circling motion of the punch.

Somehow disabled the fcu when cleaning. Cannot get the takedown pin to slide in even with moving the slide catch up. I was able to fix it but not sure how... Any thoughts, suggestions or ideas?

Where is the best place to get a lower assembly?

Good video.. your pretty good..

Love all your videos! Thank you for all the help you’ve provided all of us! I do have an issue. My fcu is from a first run x5 and it does not look like this. I do not have the disconnector between the sear housing and frame and have a small round spring with two tails that popped out from somewhere? I think I found that is called the safety spring. The x5 doesn’t have any external safety for this to operate. Any direction would be grateful.

My trigger wont reset. Do i just need to get a new trigger bar spring?

You mentioned in another video lubing all metal to metal contact. How come you don’t lube where the slide runs along the FCU catch? Or does that risk getting contaminates inside the striker area?

I have absolutely no idea how the FCU works. I watched the whole video, and I still dont know. But, I was given an FCU in parts for an 80% I am working on and I was able to follow along step-by-step. Did not have any problems, did not have any questions, and it all fit together as it was supposed to. It is very impressive that a novice like me can follow along to this and in under 20 minutes I have a functioning fire control unit. Great work not wasting anyone's time but also being thorough enough to follow along, thats a hard thing to balance

Just a heads up for anyone having the same struggle I did, I had to end up putting the trigger and trigger bar together then put the trigger into the frame with the return spring end of the trigger bar disconnected. Then you can put the straight(ish) end through the bar from the outside and rotate the hook side up into it's hole from the inside and you're done. Might have just been the AC +10% return spring I was using but I couldn't get the trigger bar to sit behind the trigger with it attached at the spring end.

Thank you

Can you put the sign lower with the Glock upper?

Sig Sauer Guy, thank you for the video. Well done sir. Felt like I was taking a Sig class. Please link where we can find your straight pick (staggered punch).

Great video, quick question. What's the reason for not installing the safety spring?

Great video, where did you get the step alignment pin?

How many of these internal parts are interchangeable with the .45? I'm seeing that the only difference That I'm seeing from looking at parts online is the slide catch. Is that right?

where can i get this ? like piece by piece to build the FCU

Anyone know where to find a p320 jig kit right now

My spring next to safety lever is out of position…I can’t see installation of it in the video? (I must have backed out the large pin while cleaning gun)

I cannot get the safety lever spring in right, it won't dry fire when fully assembled, and the trigger won't reset, any advice?

What kind of grease is used? Can a picture or link to buy the grease be provided?

While reassembling the pistol today (p320 AXG classic), somehow the FCU got caught on the slide and came out with the slide. I’ve taken this pistol down quite a few times and have never seen this happen. When I pulled it out from the slide, the Sear, and the larger pin on the left came out flinging the two little springs on the sear into the air. What a mess! My problem is that I can’t seem to get the sear to clip back into place. I’m assuming you need to get the sear all the way down before the pin on the right (larger pin), can be reinserted? Because I tried inserting the pin before and after trying to push the Sear with the springs attached, and neither worked. This made me believe that I might actually have to disassemble more of the FCU than I’m comfortable with doing. Do you think that this is true? That I will have to disassemble the back end to get the sear back in correctly? Or am I missing something here?

Everytime I clean my P320 the pin at 6:06 is sticking out evenly on both sides, is that normal?

You are a godsend my friend! Thank you so much. Any thoughts on the p320 conversion kits

You should try to build a jsd supply module

my fcu doesnt have the same parts on a regular full size p320

Just a question on your punch, who makes that step model and where can one get it?

I wish i just bought a sig instead of polymer 80 glock19 with the parts that go with it you have to change out ejector extractor guide rod is a jock you get a parts kit that is trash thanks glock gen 3 so much fun have to buy more parts

I've tried your method of installing the P320 trigger spring and I can't get the hole to match up with the nub on the trigger. I've read that the newer FCU's are more difficult. Can you please give me any hints.

🔥

Hey. Avid watcher because I have a East German 226. But thinking on becoming a gun smith. Is their a accredited school that only does Sig Sauer gun smithing?

What's the name of the pin punch that's stepped? I want to buy one

whats that round puck called that you use

Super helpful! Coming from glocks its a step up!

Whats the difference with the FCU for the 45 acp??

Where does one get the pin tool that has steps to it?

Do you happen to remember what grease you used in this video?

Are the parts the same for the safety fcu vs the no safety fcu?

Thats a vape coil tool , lol. Pretty cool

This was super helpful for assembly of my MUP-1, thank you! One question though, and anyone who knows please feel free to answer- what is the O-ring for? The diameter is equal to or almost equal to the diameter of the notch that the trigger sits in, but I don’t see it in the couple assembly videos I’ve watched. Thanks!

Hey i got a question, id like to like message u direct. I have a pic i have a spring creeping out insde my xfive fcu. N none of my other p320s have this. Canni message u to send pic?

Half the time your just out of cameras veiw and you keep getting left and right mixed up.....this is the second time I've tried to assemble my fcu to this video only to fuck up my roll pin because you keep getting left and right confused

The hardest part with the trigger was off screen come on man