G GMAN_R New member Jan 31, 2015 #1 What's the main difference? I see the barrel twist rates are different. Is the AR 556 a direct impingement gas system whereas the SR 556 is a piston rig?
What's the main difference? I see the barrel twist rates are different. Is the AR 556 a direct impingement gas system whereas the SR 556 is a piston rig?
JoeBobOutfitters New member Jan 31, 2015 #2 Apples and oranges. AR556=cheaper and Direct Impingement (very popular) SR556=more expensive & piston (not real popular)
Apples and oranges. AR556=cheaper and Direct Impingement (very popular) SR556=more expensive & piston (not real popular)