Our BCGs come standard with a full profile carrier while many AR-15s these days are sold with a lightweight semi-auto carrier. The difference can be seen in the photo above. The full profile carrier simply has more weight to it, about 0.5 oz. more. Just like a heavier buffer, a heavier carrier can have certain benefits in an AR-15.
The extra weight helps to smooth the function of the AR-15 by slightly delaying the unlocking of the action allowing pressure in the chamber to decrease, resulting in more consistent and reliable case extraction.
The extra weight also causes the bolt carrier group to move forward with more authority, stripping and feeding the next round from the magazine into the chamber more reliably. This can be especially helpful if the rifle is dirty or under lubricated.
Since the carrier and buffer essentially act as a unit during the cycling of the rifle, the use of a full profile carrier over a semi-auto carrier adds roughly two-thirds of the weight you'd get by going to the next heavier buffer.[powr-tabs id=ddd30581_1501005982]