Here is the vintage pistol from gta v.

If you want to follow my weapon converting program, you must add it to the game with the Ryosuke's Weapon Limit Adjuster (http://hotmist.ddo.jp/plugin/wlimit/wlimit04.zip)
After that, follow the istruction in the readme for installing it.
[ALL MISTERIX 4 WEAPON RELEASED IN THE PAST NEEDED]

Credits:
Ryosuke, for his Weapon Limit Adjuster
Automan, the creator of Misterix, for his help with some stuffs