This skin is a property of kEaWWAN, The owner and creator, This is a reskin/retexture on the "original" Glock.

Howto install put "pist_glock18" into /steam/steamapps/(ur acc name)/cstrike/materials/models/weapons/v_models
Howto install put "w_pist_glock18" into /steam/steamapps/(ur acc name)/cstrike/materials/models/weapons/w_models