This Mil-Spec AR-15 buffer spring replacement is designed for 223/5.56mm calibers and fits all mil-spec, commercial carbine length buffer tubes. This high-quality AR-15 M4 carbine buffer spring is heat treated 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 will ensure smooth and reliable operation of your AR-15, 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.