I tried shooting my new to me p64. One round gets stuck halfway in the chamber, second round is pushing the first one up. If I load one round in the magazine and rack it, it shoots fine. I saw the problem and fix on youtube. The magazines in the video were from keep shooting and I suspect the ones with the gun came from the same place. The feed lips are a tad to long. The fix was to lay a factory mag on the new mags and trace what needs to be ground off. Does anyone have a factory mag for sale? The gun in the vid said the mags fit in newer guns but won't work right in older ones unless the feed lips are cut down.