The bolt rotates to extract the fired situation, the dust address is cammed open, the bolt begins to force the curved feed channel to the still left with the feed pawls to engage a different joined cartridge, the rear on the fired case strikes the fixed ejector forcing the situation https://gunneryabxr.mdkblog.com/24387666/an-unbiased-view-of-barrett-m107a1-50-bmg-for-sale