Hello all, i cant seem to find a definitive answer on this either way . I have an SI Defense matched 308 receiver set , a 24 inch kreiger 260 barrel and a bat machine receiver extension . Do i have my choice of dpms or armalite style bolt carrier group or do i need to stick with dpms. I would like to run the armalite due to the balanced lugs and smaller firing pin diameter but im not 100 percent if it will be compatible with the bat extension , bat says dpms will definitly work and armalite should work they think , not confidence inspiring for the armalite.