The BCMGUNFIGHTER stock assembly - MOD 0 - SOPMOD (Widebody) is engineered as the most robust lightweight polymer stock compatible with mil-spec receiver extensions. It features an enhanced SOPMOD type cheek weld and a snag-free design, eliminating sharp edges to prevent entanglement with the shooter's sling, MOLLE gear or other equipment. The stock includes a modular Vehicle Borne Operations Sling Tab (VBOST), which integrates with the shooter's riggers' band or bungee to secure the sling against the stock when the carbine is not in use, a common requirement during vehicle operations. It offers two types of ambidextrous sling mounting options, including QD swivel sockets. The design is modular, consisting of six parts and one screw, allowing for future adaptability and configuration of stock options. Reduces perceived recoil while maintaining operational reliability Ensures a more uniform carrier velocity, enhancing accuracy and reliability compared to traditional carbine buffer systems The extension of internal counterweight travel minimizes bolt bounce Incorporates an internal spring mechanism to minimize noise generated by counterweight movement and to ensure consistent weight distribution This kit includes all components required for mounting a mil-spec dimension stock assembly to a mil-spec lower receiver Action spring for mil-spec M16A4 rifle Castle lock nut, M4 specification Receiver QD end plate with integrated mount for QD swivel The mil-spec M16A4 rifle spring is engineered with a greater number of coils compared to the M4 carbine spring This design enhancement improves operational consistency and expands the functional range of the firearm The buffer is constructed from 7075-T6 aluminum and features a hardcoat anodized finish to ensure long-lasting durability It is composed of military specification (mil-spec) components This component is approximately 3/4 inch longer than the standard carbine model It is constructed from 7076-T6 aluminum alloy and features an 8-position adjustment The extension adheres to mil-spec diameter standards