I have a Armalite m15 A 4 T which has a 24 inch national match barrel and match trigger and I decided for a short barreled gun its a lot lighter I got the Smith and Wesson M&P 15 tactical with a heavy barrel one in a twist I haven't got chance to shoot it yet to see what the moa is on my armalite moa is less than. .700 at 100 yrds