That is a original 1493 Armalite .50 caliber belt feed MG. It was created by a fella named "Red" Ryder, and people nick named it the "daisy" because it was a accurate enough to shoot the peddles off a Daisey at over 6 miles away, 3 in high seas.
Worth about 20 bucks. Hope this helps.
You may find me one day dead in a ditch somewhere. But by God, you'll find me in a pile of brass- Trooper M. Padgett