Lee lower, arc fire, #28 locking piece, Mac 5k and mil spec trigger shooting 124 blazer with B&t print x rbs 9 suppressor. Got it down to 909 rpm by filing, and tuning the trigger bar and arc fire interaction area so it resets and releases at the appropriate time. Also yes I know Lee lower super safety is inferior to a real pack, and I already spent money on it before they announced the drop ins so I’m riding with it. Just know it can be done ..
Just posting I’ve seen people say if you put Military armament corp for the manufacturer for form 1 that it wouldn’t be approved. I filed mine and got approved at day 60 putting MAC as the manufacture, and their US location. I’m unsure if something has changed or not I filed mine before I seen the other way with Merstav so I was pretty sure I just wasted my time thankfully it was approved. I filed on the atf site instead of using silencer shop because it’s to easy filing yourself to pay 50$ to get done by them. Just an fyi go to the atf website, and they’ll send you finger print cards for free. Mine didn’t take any longer to be approved using paper instead of electronic fingerprint which would be the only reason IMO to pay silencer shop to do it. I’m not judging those who do I’m just trying to let people know that doesn’t wanna use them it’s free and easy to do yourself and it isn’t any quicker approved using eft and SS on Form 1 at least,and also that using MAC as manufacturer worked in my case.