The pistol is cheaply made, you proably don't want to go any further than field stripping.
Here's how to strip it:
Remove the clip and make sure the gun IS NOT LOADED.
Double check that the gun is not loaded.
Triple check that there is not a bullet in the chamber.
Push in the button under the slide towards the rear of the gun, on the side that says "Sterling Arms". The keeper kill pop out of the back of the gun.
Lift the back of the slide up, then back and off the frame.
Best left to a gunsmith
If you don't have a manual, get help from a gunsmith
You need a gunsmith
Best to let a gunsmith show you how.
on the right side of a crvena zastava-cal 7.65mm mod70 pistol you will see a round pin above the trigger push that pin out and the pistol will disassemble by pulling the slide forward. johnny
a semi automatic 25 caliber pistol.
Auction Arms has one on its site.
Your best bet is to go to a gunsmith.
If you don't have an owner's manual, find a gunsmith and ask for help
Assuming you mean a Sterling mdl 287 PPL in cal. .380, these retailed new for about $90.
100-300 USD or so
-50-300 usd