brennan moved the feed ramp from the ar-10 barrel extension to the detachable magazines. according to brennan, this alteration is one reason why the 45 raptor can feed wide-mouth hollow point rounds better than competing cartridges. standard, straight-wall magazines are modified by shortening the follower and installing an insert that includes the feed ramp. curved magazines cannot accept the insert, and are therefore incompatible with the 45 raptor conversion. magazine capacity is not altered.