Machined from 7075-T6 aluminum and finished with a type 3 hardcoat Anodize, the Geissele premium mil-spec buffer tube is built to last. This durable, rigid buffer tube adheres to all mil-spec standards, featuring six stock positions and a carbine length with a mil-spec diameter. Weighing in at only 3.7oz, it's the ideal complement for your AR-15 lower and works seamlessly with most mil-spec diameter AR-15 stocks. The package includes a high-quality mil-spec castle nut and end plate. The Geissele Super 42 spring enhances your AR-15's performance, using a unique three-strand design inspired by the German MG42 Machine Gun. This spring design helps absorb excess energy and reduces spring failure, all while eliminating the typical spring "twang" and providing a 15% stronger return force. This makes it especially useful in dirty rifles or with steel-case ammunition, ensuring smoother operation. Constructed from high-quality 7075-T6 aluminum Completed with type III hardcoat anodize finish Number of stock positions is 6 The innovative spring design incorporates three separate wire strands The super 42 spring exhibits an average return force that is 15% stronger than that of the standard buffer spring