Guntec USA AR-15 A2 Buffer Tube Kit w/ Buffer & Spring

The Guntec USA AR-15 A2 Buffer Tube Kit is a complete fixed-stock buffer assembly for the AR-15 platform. The drop-in package pairs an A2-style aluminum buffer tube with a matching A2 buffer and rifle-length buffer spring, giving builders everything needed to install or refresh a traditional A2 fixed buttstock setup on a standard AR-15 lower receiver.

The tube is machined from T6 6061 aluminum for an excellent strength-to-weight ratio and finished in a low-glare matte coating. It is engineered for a precise fit on standard AR-15 lower receivers, with the standard mil-spec threading needed to mount an A2 fixed buttstock and castle nut. The included A2 buffer and rifle-length spring are weight-matched for reliable cycling with a fixed buttstock configuration, making this kit a straightforward solution for completing an AR-15 lower or replacing a worn A2-style assembly.