I did my form 1 and got it back and approved in 21 days. I now have a stock on my ar9. It was going to be SBR form 1 any way. I hated the brace on it. We have a 300 blackout going the same way.
I have the Hyper fire two stage in mine. I love it. Install is a bit tricky as well as safety selection. two pound first stage, 1.5 lb second. Almost scares ya when the gun goes off
I have the hyper fire 2 stage in my 308. Had a decent trigger before but for bench i wanted the 2 stage. Hyper fires are different. The trigger pull weight has nothing to do with the hammer springs. A bit finicky to put them together but wonderful to shoot.