Ignore any talk of "accuracy dots"; they are nonsense.
Make sure you get both magazines, the holster, lanyard, and cleaning rod. Don't let them sell them seperately as accessories.
You might lock the slide open on an empty magazine, then remove the magazine to see if the slide slams forward as the mag comes out. Mine does this and it's a little bit of a PITA.
The original finish is a grey park (?), and the arsenal refinish is black.
Check the magazine floorplates for damage. The field method for removing the barrel from the slide is to put the forward end of the floorplate into the groove under the barrel. I suppose it works, but it bends the floorplates to crap. They can be bent back into shape, but if you can avoid it, why not?
Also, I had one magazine that would eject its damaged (from above, I'm sure) floorplate along with spring and ammo after a few shots. I fixed it by laying the mag's floorplate lips (disassembled) on the edge of a metal surface (vise's anvil flat, behind jaws) and gave them a few good raps up and down the edge. The floorplates now fit snugly and stay in place.
Stay away from the Czech surplus ammo (grey case, silver bullet) that comes 40-rnds per box, on stripper clips. It has really hard primers and was probably made for the PPsh submachinegun.
A better deal is the Makarov. I use my Mak far more than my CZ-52.
check out
http://www.makarov.com for parts and accessories for both Mak and CZ-52.