Having mag trouble.  In a BM upprer/Lower, that's 100% w/ other mags.  Having trouble feeding when cartridge is to right side of magazine only.  When stack alternates to l/s feeds fine, when on rt. NG.  
1st, GI "TYPE" Al/Teflon/30, difficulty seating w/ bolt closed.  Experienced some mag. feed lip material removal, when bolt slammed home, self clearancing type of thing, pulled mag and hit it w/ file, some improvement.  But now the new problem.  Any tips, would be greatly apprciated.