VG6 Epsilon Muzzle Brake Posted January 19, 2015 in AR-15, Companies by Nicholas C with 10 CommentsTags: Full-auto, muzzle brake, VG6 Precision Here is a very interesting test of this VG6 Precision AR muzzle brake. The shooter is firing the AR on full auto, with one hand and away from his shoulder. The gun hardly moves at all.