06-30-2021, 04:35 AM
Ok Im new to Ar so please be gentle! I just received a windham weaponary 5.56 but I would love to change the caliber to 6.5 grendal what would I have to do? Do I need to get a whole new upper or just a barrel bag and buffer? Is my lower going to accept any upper or does it have to be by windham?

