The Vltor Weapon Systems A5 Spring And Buffer Kit is a purpose-built recoil system for AR-15 and M16 carbines, combining a standard M16A2 action spring with a specially designed A5 buffer and hardware. Together, these components deliver the smooth, consistent impulse of a fixed-stock rifle while helping to reduce felt recoil and moderate cyclic rate for improved control.

This kit is ideal for shooters upgrading an existing carbine to the longer, 7-position A5 receiver extension for use with mil-spec M4-type buttstocks. When installed in the correct Vltor A5 receiver extension, it supports reliable operation with both direct-impingement and gas piston systems and is not intended for AR-style .308 platforms. Whether you are focused on range work, training, or refining a duty-ready carbine, the A5 system reflects Vltor’s reputation for thoughtful engineering and dependable performance.

• Manufacturer: VLTOR
• Model: A5 Spring And Buffer Kit
• Firearm Type: AR-15
• Includes: Action spring, A5 buffer, receiver end lock plate, receiver end lock nut
• Compatibility: Must be used with Vltor A5 receiver extension; compatible with gas piston systems; not compatible with AR-style .308 platforms