I am not an AR person whatsoever, and could use some help for a Christmas present for my son. He has a Smith and Wesson M+P AR15. He mentioned a while ago that he was thinking about a Proof Research barrel for his AR, but they were really expensive and he didn't have the money right then. I did some research on Proof Research's sight, but could not find AR15 barrels that were 223/5.56, could only find a barrel in 223 Wylde. I don't know too much about ARs, but.....I do know that he wants a .223/5.56 barrel. Can someone give me some direction please. It doesn't have to be a Proof Research barrel, just looking for a barrel for an AR15 that will shoot bug holes. Preferably an 18 inch barrel, on the heavier side and in the $800 price range. Thanks for any help