From what I understand is that these Magpul QD sling swivels are the QDsling swivel that will stay locked into the butt stock of a Beretta A300 Ultima Patrol. I have heard of a few people's slings with QD sling swivels popping out and sending their A300 Patrols hitting the ground as they weren't quick enough to catch the strap before it "Got Away/; I guess I will be finding out for myself IF my local gun dealer ever finds me a Beretta A300 Ultima Patrol in tiger stripe