Spike's Tactical is a US manufacturer which creates high quality parts, uppers, and complete rifles. Every component is manufactured to Mil-spec standards and is backed by the Spikes Tactical lifetime warranty. This high quality AR-15 Carbine heavy buffer is made from CNC machined solid billet aluminum bar stock and features a tough anodized matte black finish. The buffer also uses a mil-spec bumper and is 100% maintenance free. Although this buffer was designed for use in conjunction with .223/5.56mm AR-15 platforms it is compatible with all current AR-15 calibers.