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The CZ-52 is NOT made by the same company that makes the CZ-75 series of pistols, but it's still a high quality piece. It's a single action only with a decocker. There is no external slide lock, but you can bump the bar up to engage it with a bit of practice.

It's famous for using a roller bearing locking system similar to some Heckler and Koch rifles. The system works quite well, although there were some issues with high round count rollers going flat. There was a company making hardened rollers in addition to repalcement firing pins. Factory firing pins were known to break in mid round count area. The replacement pins also lowered and smoothed trigger pull, but some models disengaged the decocker function.

Wolff gunsprings has recoil springs.

Harrington Products has the firing pins and rollers.
http://www.harringtonproducts.com/firing-pins/

The original Makarov.com website has a page in info about the CZ-52.
http://www.makarov.com/cz52/index.html

As to supply, check the surplus importers. Most will sell to you thru a local FFL transfer. It runs in batches however, and a quick check doesn't show any of my usual folks having them in stock presently.
 

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Unconfirmed safety note.

There seem to be at least 3 different 'grades' of 7.62x25 ammo.

Normal commercial stuff.

Military surplus.

and Military surplus designed for the sub-machine carbine (PPSh-41 and similar). This stuff is supposedly VERY hot and more than even the CZ-52 can regularly handle. It's rare, but something to keep an eye out for.

Another confirmed note, the surplus stuff is almost always corrosive. Make sure windex/ammonia out the barrel immediately post-shooting.
 
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