The MOE Carbine Stock - Commercial-Spec Model (Magpul Original Equipment) is a drop-in replacement buttstock for AR15/M4 carbines using Commercial-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 Commercial-Spec Model includes an extended 0.55" thick rubber butt-pad to provide positive shoulder purchase and accommodates the longer, slanted back common to most commercial-spec tubes. 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 SET IT AND FORGET IT -Shielded release latch prevents snagging and accidental operation Product Specifications Platform: AR10, AR15, M4, M16, M110, SR25 LOP, M4 Collapsed: ~10.8" LOP, M4 Extended: ~14.6" LOP Adjustment Range: 3.8" Length, max: 7.2" Weight: 8.5 oz Weight: 13.8 oz (with receiver extension) Origin: Made in the USA Compatibility: Com-Spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, LMT, Ruger, S&W, SIG, and others