Originally Posted by metroATL
Is there an advantage to an HBAR vs an m4 profile in a 16 inch rifle?
Accuracy. The pic below shows a comparison between a Colt 16" HBAR and a Colt 16" M4 (government profile) barrel. Three 10-shot groups were fired from each barrel at a distance of 100 yards. The 10-shot groups were over-layed on each other using RSI Shooting Lab
and the mean radii were calculated for the 30-shot composite groups.