M4 barrels are 1:7. Civ rifles seem to be 1:7 to 1:9. (civ are more likely to use 55gr still; military is 62gr, and there are people using 77gr...) I hate th

M4 barrels are 1:7. Civ rifles seem to be 1:7 to 1:9. (civ are more likely to use 55gr still; military is 62gr, and there are people using 77gr...) I hate the forward assist, but not enough to delete it. I mostly use an X95 SBR (13") now, though.