Randy, the dimensions are similar but the 5.56 NATO round is higher pressure. With that barrel you will be able to run .223 and 5.56, but don't run 5.56 in a .223 barrel.


USMC 1997-2002. 6173 CH-53D Sea Stallion Helicopter Crew Chief and Flightline Mechanic. Semper Fi!

"Be still, Taggart!"