This Mil Spec ar-15 carbine buffer spring replacement kit is designed for 223 5.56mm caliber carbine rifles. Upgrade AR 15 Buffer Spring kit fits all mil-spec and commercial AR 15 and M4 carbine length buffer tubes. This upgrade AR 15 Buffer Spring kit fits all mil-spec and commercial carbine length buffer tubes. This high-quality AR-15 M4 carbine buffer spring is heat treated spring steel and made in the USA with a limited lifetime warranty. In order for your AR 15 to operate reliably, you should replace your AR-15 buffer spring after 5000 to 6000 rounds, especially if your AR-15 is not cycling properly. This high-quality replacement ar-15 buffer spring upgrade kit will ensure smooth and reliable operation of your AR15, M16 and M4 carbine rifles.
This buffer spring Fits AR-15/M16 carbines chambered in .223/5.56mm with M4 style receiver extension buffer tube for collapsible buttstocks.