New Pistol Sound (Right Channel Fix) - GTA5-Mods.com
CS:S Realistic Weapons Sounds addon - Mod DB
CS:GO M4A1-S Sounds for GTA San Andreas - YouTube
Counter-Strike: Global Offensive: Old sounds mod (Weapons /& Footsteps) - YouTube
V1.3 of the CSGO Weapon Balance Mod Has Released! Details Regarding Changes (such as a complete pistol overhaul) and How to Play Inside : r/GlobalOffensive