Hello everyone,
My buddy called today to let me know his recently purchased conversion wouldn't lock the hammer back to fire another round. It would however, move back enough to pick-up and chamber one. He tried this conversion on an SP1 Carbine (with AR hammer) and an M16A1 retro build (semi-auto with a modified M16 hammer) and it malfunctioned in both. He tried his Army M261 and his Air Force in both without any problems. He used the same ammo in all 3 units (Federal 40 grain lead round nose). He had 5 rounds of CCI Mini Mags laying around and the first 4 worked fine with the 5th jamming (he believes due to the longer case, apparently). The only thing I could offer for him to try was a different Colt magazine (that was the only thing he didn't try). Anyway, if anyone here can give me some advice regarding this issue, I'll pass it on and my buddy will certainly be thankful. Thanks!