Spike's M4 Complete Stock Kit St-t2

The Spike's M4 Complete Stock Kit ST-T2 is a ready-to-install assembly solution for completing the rear end of an AR-15 lower receiver. This Spike's Tactical kit bundles all the essential components needed for a proper buttstock installation: a 6-position mil-spec buffer tube, M4 collapsible buttstock, receiver end plate, castle nut, buffer spring, and the ST-T2 heavy carbine buffer. Operators building or upgrading AR rifles benefit from purchasing matched components as a kit rather than sourcing individual parts, ensuring compatibility and reducing assembly time during lower receiver completion.

The ST-T2 heavy carbine buffer differentiates this kit from standard configurations. Heavy buffers reduce bolt carrier group velocity and increase dwell time, which can improve reliability in short-stroke or suppressed setups and lower felt recoil impulse compared to standard carbine buffers. The 6-position tube allows shooters to tailor length of pull from fully collapsed to extended positions, accommodating different shooter builds, gear configurations, and shooting positions. The mil-spec receiver end plate and castle nut meet military-standard dimensions and tolerances, ensuring fitment on any mil-spec lower receiver. Black finish provides corrosion resistance and a professional appearance standard across tactical platforms.

This kit addresses the need for a complete, vetted stock assembly for AR builders, law enforcement outfitting, military armorers, and precision shooters completing lower receivers from stripped components. Whether building a duty carbine, training rifle, or tactical platform, having a matched stock assembly eliminates guesswork during assembly and reduces the likelihood of incompatible or substandard components on the firing end of the weapon system. The heavy buffer specification makes this kit particularly suited to builders running shorter barrels, suppressors, or other configurations where bolt carrier velocity management is a priority.