Shooting the AR-15, the M1-A, & the SKS at thick steel: a close-up perspective. Shots were taken from behind a large tree at approximately 40 yards. Guns used: Russian SKS, Colt AR-15 A2, Springfield M1-A Disclaimer: Lots of discussion about 5.56 vs .223 and 7.62 X 51 vs .308. The guns you see me use in this video will fire either one safely, so no issue for me. Never HAS been. Be sure you do your research and shoot what your guns will handle.