CMMG Action Spring – AR-15 Carbine Buffer System

The CMMG AR-15 Carbine Action Spring is a replacement or spare spring designed for carbine-length buffer systems in AR-15 platforms. This spring cycles the bolt carrier group rearward and returns it to battery during firing. Over time and use, action springs can weaken or take a set, leading to reliability issues—keeping a quality spare on hand ensures your rifle stays in fighting condition.

Manufactured from heat-treated chrome silicon wire to CMMG's specifications, this spring delivers consistent tension and durability. It installs in seconds as a drop-in component—simply remove the buffer retaining pin, pull the buffer and old spring from the receiver extension, and replace. No gunsmithing required. Compatible with mil-spec carbine buffer tubes on standard AR-15 rifles and carbines.

• Part Type: Action Spring (Buffer Spring)
• Compatible Firearms: AR-15 Carbine-Length Buffer Systems
• Material: Chrome Silicon Wire
• Finish: As Manufactured
• Installation: Drop-In
• Includes: One Action Spring