Although I prefer the standard length barrel on a standard M-14 rifle, I do like the looks of a bush barrel on my M-14CM4 Tactical stock. I've been told that the bush barrel's 18" may be more accurate due to the projectile passing the gas port in the barrel prior to the gas cylinder cycling the rifle. I don't know for sure but in theory it sounds like it could be so. Anyone know of this for sure?azski said:My question is... what's the reason/benefit to make a CQB M1A?