Another kind of rare gun to be honest, the Chinese Norinco CS/LP8A revolver that shoots 9mm .38 Special rounds, shown in the China International Aviation & Aerospace Exhibition back in 2018.

Not really sure about the gun's overall information though, since the information of it is very limited on the Internet, but I think it's mainly for police usage and for export only.

Gmod version:
https://steamcommunity.com/sharedfiles/filedetails/?id=2752498908

The model was ported from a L4D2 mod with permission granted:
https://steamcommunity.com/sharedfiles/filedetails/?id=2599956395

Includes:
l4d2_mod\zzzs570\cs_lp8a\l4d2_mod_cs_lp8a.mdl
l4d2_mod\zzzs570\cs_lp8a\l4d2_mod_cs_lp8a_bullet.mdl
l4d2_mod\zzzs570\cs_lp8a\l4d2_mod_cs_lp8a_sight.mdl

Credits :
zzzs570 - Original creator of the model and the L4D2 mod.
NeoLin - Porting to Gmod and SFM.

Feel free to support the Lambda Group for more addons.👌
https://ko-fi.com/neolin7812
https://www.paypal.com/paypalme/NeoLin7812