Armaspec Buffer Retainer w/Spring SS. These AR15 Lower Parts brought to you by Armaspec are crafted from stainless steel for an incredibly durable addition to your firearm that's built to last. This Armaspec AR-15 Buffer Retainer includes a spring so that you're ready to install it right out of the box. Trust this Armaspec Rifle Buffer Retainer to deliver reliable performance time and time again. Specifications for Armaspec Buffer Retainer w/Spring: Manufacturer: Armaspec Color: Stainless Country of Origin: USA Gun Model: AR-10 AR-15 Features of Armaspec Buffer Retainer w/Spring Machined from quality corrosion resistant stainless steel Package Contents: Armaspec Buffer Retainer w/Spring What firearm models does the manufacturer say Armaspec Buffer Retainer w/Spring is compatible with? The manufacturer says that Armaspec Buffer Retainer w/Spring is compatible with AR-15 AR-10Armaspec ARM139-SS: Buffer Retainer w/Spring SS