This download looks like an addon. You need to extract the downloaded zip and put the addon folder in your Garry's Mod addons folder. You should end up with a directory structure similar to below:
-
steamapps
-
common
-
garrysmod
-
garrysmod
-
addons
-
Rin's CSGO Pistols <-- Addon folder!
-
e.g.
-
lua
-
maps
-
materials
-
models
-
etc
- Rin's CSGO Pistols/
- addon.txt
- materials/
- weapons/
- csgo_pistols/
- exponent.vtf
- fiveseven.vmt
- fiveseven.vtf
- fiveseven_exponent.vtf
- light_c.vmt
- light_c.vtf
- light_n.vtf
- m9a1.vmt
- m9a1.vtf
- m9a1_exponent.vtf
- p250.vmt
- p250.vtf
- p250_spec.vtf
- pist_deagle.vmt
- pist_deagle.vtf
- pist_glock18.vmt
- pist_glock18.vtf
- pist_glock18_exponent.vtf
- pist_hkp2000.vmt
- pist_hkp2000.vtf
- pist_hkp2000_exponent.vtf
- pist_tec9.vmt
- pist_tec9.vtf
- pist_tec9_ref.vtf
- sup1_c.vmt
- sup1_c.vtf
- sup1_n.vtf
- models/
- weapons/
- rinfect/
- CSGO/
- Pistols/
- pi_57.dx80.vtx
- pi_57.dx90.vtx
- pi_57.mdl
- pi_57.phy
- pi_57.sw.vtx
- pi_57.vvd
- pi_deagle.dx80.vtx
- pi_deagle.dx90.vtx
- pi_deagle.mdl
- pi_deagle.phy
- pi_deagle.sw.vtx
- pi_deagle.vvd
- pi_Elite.dx80.vtx
- pi_Elite.dx90.vtx
- pi_elite.mdl
- pi_Elite.phy
- pi_Elite.sw.vtx
- pi_elite.vvd
- pi_G18.dx80.vtx
- pi_G18.dx90.vtx
- pi_g18.mdl
- pi_G18.phy
- pi_G18.sw.vtx
- pi_g18.vvd
- pi_P2000.dx80.vtx
- pi_P2000.dx90.vtx
- pi_p2000.mdl
- pi_P2000.phy
- pi_P2000.sw.vtx
- pi_p2000.vvd
- pi_P250.dx80.vtx
- pi_P250.dx90.vtx
- pi_p250.mdl
- pi_P250.phy
- pi_P250.sw.vtx
- pi_p250.vvd
- pi_tec9.dx80.vtx
- pi_tec9.dx90.vtx
- pi_tec9.mdl
- pi_tec9.phy
- pi_tec9.sw.vtx
- pi_tec9.vvd
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