03-12-2013, 09:59 PM
The AA upper is marked 6.5 Gren, both other rifles (one of which is an AA 18") are marked "6.5 Grendel". Issued experienced have occured with all 3 rifles using AA factory ammo. A bit frustrating, we'll measure OAL and see what's up. It's got to be the ammo if issues are with 3 guns. Never had a problem with Hornady ammo.

