Polish P-64 Magazine

I bought two of these and neither one worked. They double feed-ed on the vey first round. I could not eject the magazine. I had to field strip the weapon and then have the range armorer help me clear it on the range. The second time, with the second magazine, once again had to field strip the weapon but this time the armorer had to take the weapon back to the shop and clear the jam. He couldn't clear it on the range. The magazine that came with my P64 worked perfectly This tells me the mags are the problem.

Received my magazine and before attempting to seat it in my gun I performed a thorough examination. The magazine was sufficiently rigid around the feed lips and magazine body and overall build quality was equal to a Polish arsenal magazine. The problem arose when I attempted to seat it one of the cut outs on the front tip of the magazine was not cut deep enough. From what I read the magazine design for the P-64 was revised around 1970 so that the feed lips were longer. if your gun was made before then magazines of the long feed lip pattern will not work. My gun was made in 1968 so sure enough, when I attempted to slam it home it wouldn't budge, I retriever file from the garage and proceeded to reprofile the front of the magazine. I was eventually able to slam the magazine home; however, Pulling the magazine out was difficult! The magazine fit the magazine well TIGHT! After playing with the gun and magazine I was at least able to loosen it up somewhat. Also. don't even think of lubing the mag body to help it slip out. Oil just makes the magazine more sticky. I'm thinking that continuing to play with it will get it to loosen up.