That doesn't look like a .50 cal. to me, at least not a Barrett. It looks like a bolt gun (.308 or .300 Win Mag. ?) Also it looks like it has a can on it, and not a muzzle brake. I could be wrong, I'm looking at a kind of small picture. Cool picture anyway, whatever he is using. I wouldn't want to be the rag-head in the cross-hairs !