I have an Anderson barrel in 1:8, a Tactical Ambush in 1:7 and a JSE Surplus in 1:9, all 16", the Tactical Ambush is a mid-length gas system, the others are carbine. All chromoly. The TA barrel is a SOCOM profile, the other two are M4. The TA barrel is more accurate with 55gr Hornady FMJBT and...