We have been doing this for quite a while. We have an FFL and do gunsmithing and other custom precision machining work.
Below are some CZ-52 pages that we find useful and interesting.
Lists like there are hard to maintain — if you find any links that don't work, or if you have any suggestions of what we might add, please let us know!
For the maximum benefit from our firing pin / trigger conversion, we recommend you also install a heavy Wolff recoil spring, 16.5 pound or heavier, available at gunsprings.com.
Steve Ricciardelli's site with:
Federal's description of 9x19mm feeding problems
Here is a description of some
9x19 Federal Barrel Feeding Problems
as quoted from the Federal conversion instruction sheet. Our redesigned extractor mostly solves this problem.
Some CZ-52 pistols converted to 9mm NATO will show feeding problems. This is primarily caused by the fact that the 9mm NATO round is shorter in length than the 7.62x25 Tokarev round. There are 2 areas of concern: magazine feed lips and the way the extractor pushes the live round into the chamber.
Surprisingly the extractor is the main cause of feeding problems. The lower 1/2 of the front end of the extractor actually contacts the round, pushing it into the chamber. By smoothing and rounding the angled surface on the lower 1/2 only, the extractor hook will not disrupt the movement of the round as it jumps around the rim of the cartridge being chambered. To remove the extractor, use a small punch to drive the pivot pin through the slide. This will release both the extractor and its spring. When you reinstall the extractor and its pin and spring, check the firing pin to see if there is free movement by pushing on the rear end against the spring pressure.
Examine the feed lips of the magazine. Look for jagged or bent edges. The metal at the lips is heat treated, so you may not be able to bend them back without weakening them. It may be necessary to have a welder add metal to the leading edges of the feed lips. Excess metal would be removed by a Dremel tool.