Product Description The Spike&';s Tactical M4 Complete Stock Assembly is a complete rear-end upgrade kit for an AR-15 lower receiver, providing the essential components needed to finish a Mil-Spec carbine buffer system. This complete kit includes a 6-position Mil-Spec buffer tube and M4 collapsible buttstock, along with the required hardware and internals the receiver end plate, castle nut, buffer spring, and an ST-T2 heavy carbine buffer for smooth, reliable operation. Finished in black, its a straightforward way to complete or refresh an AR build with quality, matched components. Product Highlights Complete M4 stock kit designed to finish the back end of an AR-15 lower receiver Includes ST-T2 heavy carbine buffer for a complete carbine buffer system setup 6-position Mil-Spec buffer tube provides adjustable length of pull with an M4 collapsible buttstock Includes essential mounting hardware: receiver end plate and castle nut Black finish for a clean, classic AR build appearance Specs Brand Name: Spike&';s Tactical Product Type: Complete M4 stock kit / stock assembly Compatibility / Fit: AR-15 / AR rifles Buffer Tube: 6-position Mil-Spec Stock: M4 collapsible buttstock Included Components: Buffer tube, buttstock, receiver end plate, castle nut, buffer spring, ST-T2 heavy carbine buffer Color/Finish: Black Manufacturer Part Number: SAK0701-K UPC: 855713006906 Disclaimer: We strive to provide accurate and up-to-date product descriptions, specifications, and images; however, errors or omissions may occasionally occur. We are not responsible for any inaccuracies or discrepancies in the content provided. If you notice anything incorrect or unclear, please contact us so we can correct it. When in doubt, we recommend verifying details directly with the products manufacturer.