Yeah, it's a Barrett.
We were shooting an M2 at the range one day and this PITA bird colonel pulls his "surprise review" He goes on to ask one of my teammates about the ROE on a 50. My pal says "anti-materiel, sir" . The Col. asks "What kind of materiel?" to which he answers "Tanks, jeeps and such, sir" Col. PITA asks "Anything else?" to which he returns, "well, sir, helicopters, canteens, beltbuckles..." The colonel got back in his mount and left.