I recently aquired a Plainfield M2 in a 3 gun purchase and am haveing a problem with the Plainfield, it won't pick up a round from the mag. and chamber it. It will begain to feed up the ramp but then the bullet hits the side of the chamber short of entering the chamber. I did get it to fire a short burst by chambering a round then inserting the loaded mag. but it only fired 3 or 4 rounds befor it failed to feed, any thoughts? Steve in OR. Its factory ammo, GI mags, and the rifle could pass as unfired in condition.