The lower came complete from Engage. So whatever they use. The ammo that was used was some old bulk ammo I had as well as some new xm193 from federal. Thanks for the help.
-Z
Thanks for all the responses. Here's a run down of the parts:
Stag upper with a JoeBob BCG
Rainier arms 10.5" barrel with A2 on the front
Carbine length gas system
I did check the gas system and found it to be in line with other rifles I have that function reliably. I have yet to try a...
I recently put together my 10.5" upper after getting my stamp back. While test firing it failed to feed on multiple occasions. It seems as though the bolt is not moving far enough back to strip the next round out of the mag. I tried several different mags to no avail. I checked the gas system...