It may very well be a mag problem. Try shimming the mag (or magwell) with some painters tape or something. I know some guns are finnicky with mags and I had to modify an entire box of mags that I got (because I guess the moulds weren't quite right and things didn't line up).
Also try firing the gun upside down and see if it feeds.
ಠ_ಠLess QQ more Pew Pew
READY TO >> RACE