Like David said, Winchester white box ammo. Get a Mec-Gar magazine, and clean and lube the gun properly prior to shooting. Don't stuff the mag. clear full. Grip the gun tightly, not loose or limp.
If this is the first time shooting that gun, load just one round a couple of times, then 2, etc. just until you are comfortable what it functions correctly, and visually inspect the gun after each round for the first few shots.
And most importantly of all, give us a range report.
dju
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