The Colt AR15A4 Receiver Extension is a rifle-length buffer tube built to Colt’s proven standard for AR-15 and M16 platforms. Designed as a true Mil-Spec style receiver extension, it provides a precise interface between your lower receiver, buffer system, and fixed stock for consistent, repeatable performance.

This receiver extension is ideal for builders and shooters who want a genuine Colt component for clone-style builds, upgrades, or refreshing a well-used rifle. Its robust construction supports smooth cycling and reliable operation across a wide range of AR-15 configurations, making it well suited for range use, training, and general-purpose shooting. Backed by Colt’s long-standing reputation in service-grade rifles, it offers dependable function in a straightforward, no-nonsense part.

• Manufacturer: Colt
• Model: AR15A4 Receiver Extension
• Style: Mil-Spec rifle-length buffer tube
• Compatible Platforms: AR-15 and M16 configurations
• Intended Use: Builds, upgrades, and replacement receiver extensions