Can an 7.62-39 run well in an AR platform? When I looked at this years ago I was told none of the guns would run well cause they needed to use a magazine that was curved like the AK magazine and there was not enough room in the standard AR magazine well to make one of the curved magazines fit. Do the 7.62-39 AR guns of today run as well as a GOOD AK gun does? What non 223/5.56 chamberings do you like, if the commie round is marginal? I like the 6.5 Grendel but don't like the idea of hunting Lapua brass in the tall summer weeds of south Florida.