UTG Pro RBU6BM Mil-Spec 6-Position Stock Assembly AR-15/M16 Black

The UTG Pro RBU6BM is a 6-position Mil-Spec collapsible stock assembly purpose-built for the AR-15/M16 platform. Engineered for heavy-duty operations with tight tolerance control, this complete buttstock kit pairs an impact-resistant high-strength polymer stock body with a mil-spec diameter aircraft aluminum extension tube featuring rolled threads for a precise, long-lasting fit. The black assembly ships complete with action spring, buffer assembly, tear-drop ring, and castle nut, so it drops onto any standard AR-15 or M16 lower receiver extension with no extra parts required. Proudly Made in USA.

The 6-position adjustment lets the shooter dial in length of pull across six detented positions for a personalized fit. The polymer cheek rest and buttpad are built from impact-resistant high-strength material, and the included mil-spec aluminum extension tube installs directly to any standard AR-15 or M16 lower receiver. This M4-style collapsible assembly ships as a complete drop-in stock kit for mil-spec carbines and rifles.