The MOE Carbine Stock - Mil-Spec model (Magpul Original Equipment) is a drop-in replacement buttstock for AR15/M16 carbines using Mil-Spec sized receiver extension tubes. Designed for light, fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent accidental activation. The Mil-Spec Model includes a standard 0.30" thick rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear. Made in the USA SECURE FIT -Premium chrome-silicon lock spring provides positive locking and long service life THE RIGHT BALANCE OF CHEEK WELD AND COMFORT -Sloping cheek weld combines a slim profile with user comfort. Side mounting slots accept optional cheek risers for NON AR15/M4 applications SET IT AND FORGET IT -Shielded release latch prevents snagging and accidental operation Product Specifications Platform: AR10, AR15, M4, M16, M110, SR25 Compatibility: Mil-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, LMT, Ruger, S&W, SIG, and others LOP, M4 Collapsed: ~10.5 in. LOP, M4 Extended: ~13.8 in. LOP Adjustment Range: 3.3 in. Length, max: 6.9 in. Weight:8.0 oz. Weight, w/ receiver extension: 12.0 oz.