Today, it’s common to see rifles chambered for both, especially AR-15 variants. And it is equally common to see ammunition in both chamberings next to each other on store shelves. But they aren’t ...
Eugene Stoner and the folks at Armalite designed the AR-15 all the way back in 1956 ... Additionally, the Army used the wrong propellant in the 5.56 ammo, which created reliability issues.
Today, it’s common to see rifles chambered for both, especially AR-15 variants. And it is equally common to see ammunition in both chamberings next to each other on store shelves. But they aren ...