In Australia I shot a 14.5" M4 (not by choice but it was better than being a spectator) back to 500m in competition against Mark 4 and Nightforce wearing DMR rifles. There were over 500 competitors and I placed 19th overall.
A little off the end of a barrel is less important than quality training.
Awesome and well done Gunnerlove, it's really great to here such real and factual information on how a 14.5" can hang with the longer DMR type set-up's.
Cheers D