I just purchased Manufacturer: Zastava Arms(Model: CZ99) Its missing the grip screw and wanted to purchase small parts to replace(springs ect..) and cant find a place online to get them??? can anyone help?? I was told this was the proper thread to ask.......
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I'd take one of the screws to a hardware store, get the size and thread pitch.  They might have a screw which will fit or you could order a few sceprews from McMaster-Carr or other vendor.  The pistol was imported by Century International IIRC and they normally don't get many if any spare parts.  The pistol is a copy of the Sig P-226 and you might get lucky in that the screw might be the same size.   Brownell's and Midway sell a lot of gun parts as does Numrich Arms, you might find the appropriate screw there.

Here is a link to Sig P-226 parts at Numrich where they have grip screws, if you get the size of your screws Numrich or Brownell's might have info on compatiable screw from different model or guns.  Brownell's sells a variety of screws which might fit if you can get the length diameter and pitch of your grip screws.

https://www.gunpartscorp.com/Manufacturers/SigarmsSigSauer-33490/AutoPistols-41939/P226-35186.htm?page=5

I've had my first CZ 99 for some time now but have not come up with a US source for springs.

EZ9, CZ999, TZ 99 and Israeli Golan pistols pretty much all use the same parts. You'd think one of those importers would have a small pile of parts.

We had a Serbian member that said he could get some parts - mandba was his ID I think.

Since I was able to make one of the springs I needed I never took him up on the offer.

Manda