Hello from NJ

[VASCAR2]

Welcome to the forum Spearxspark! A Friend has a 24” Alexander Arms AR-15 and it uses a rifle length gas system. There are two forum members I know have 28” AR-15’s in 6.5 Grendel but don’t remember if they are using rifle length or longer gas port. As long as you aren’t going to be using a suppressor I think a rifle length gas system will work. The velocity gain from 24”-26” barrel won’t be much, maybe 40 FPS difference.