Product DescriptionThe Aim Sports ARSTKCC 6-position M4 stock kit is a complete, Mil-Spec collapsible stock assembly designed for AR-platform rifles. Built around a reinforced polymer stock and an aluminum Mil-Spec carbine receiver extension (buffer tube), this kit includes the essential components needed to finish out a lower receiver. It also features a QD swivel cup and an ambidextrous sling mount end plate for flexible sling setup and improved handling.Product Highlights Complete Mil-Spec AR-15/M4 collapsible stock kit for AR-platform builds and replacements 6-position adjustable, slant-back reinforced polymer M4-style stock in black Includes Mil-Spec carbine buffer tube (receiver extension), standard carbine recoil spring, and standard buffer QD swivel cup plus ambidextrous sling attachment end plate for versatile sling mounting Kit includes receiver extension castle nut for a full stock assembly installSpecs Brand: Aim Sports Manufacturer Part Number: ARSTKCC UPC: 815879018090 Platform Compatibility: AR-15 / M4 (AR-platform) Stock Type: Collapsible, 6-position (Mil-Spec) Color / Finish: Black Materials: Polymer stock / Aluminum receiver extension (buffer tube) Buffer Tube Outside Diameter: 1.48 in (Mil-Spec) Adjustable Length Range: 7.5 in to 10.625 in Included Components: Mil-Spec buffer tube, standard carbine recoil spring, standard buffer, ambidextrous sling attachment end plate, receiver extension castle nut, polymer stock Approx. Weight: 1.1 lbDisclaimer: 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 product's manufacturer.