Nikon D90 Video Test bump firing a Norinco Mak 90 Norinco Mak 90 Ak-47 bumpfire bumfire semi-automatic full auto test HK mp5 SAS .308 Ar-15 7.62x39mm Ak 47 Mak 90 Chinese gun fire weapon armor pearcing rounds RPD 600rpm Fast Full Auto Machine Gu D90 Sports Shots. Shots taken during pre-game…