The Magpul CTR (Compact/Type Restricted) – Mil-Spec Model is a drop-in replacement butt stock 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 extra-power lock mechanism uses a premium chrome-silicon spring to avert auto-collapse failure and maintains strength by resisting spring relaxation. The CTR also features a supplemental friction lock system that minimizes wobble* for enhanced weapon stability and accuracy. The Mil-Spec Model includes a standard 0.30" rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear. Made in U.S.A. * Friction lock performance may vary depending on the receiver extension's dimensional tolerances. Features Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below) Supplemental friction lock minimizes accuracy robbing wobble* Premium chrome-silicon lock spring provides positive locking and long service life Sloping cheek weld combines a slim profile with user comfort Shielded release latch prevents snagging and accidental operation Side mounting slots accept optional cheek risers for NON-AR15/M16 applications Compatible with Magpul ASAP® and other receiver-mount sling attachments Sling Mounts Rear - Push-button QD sling mount accommodates up to 1.5" swivels (Ambidextrous) Rear/Bottom - 1.25" sling loops Toe - Lanyard hole for custom para-cord rigs Included Accessories** Rubber Butt-Pad, 0.30" (Removable) Optional Accessories** Extended Rubber Butt-Pad, 0.55" Enhanced Rubber Butt-Pad, 0.70" Cheek Risers (0.25", 0.50", 0.75" for NON-AR15/M16 applications) Specifications** CTR, Mil-Spec (w/ Rubber Butt-Pad, 0.30") Weight, Stock: 0.55 lb. Weight, w/ Rec. Extension: 0.86 lb. Length, Stock: 6.90 in. LOP Adjustment Range: 3.25 in. LOP, M4 Collapsed: 10.70 in. LOP, M4 Extended: 13.95 in. NOTE: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec and commercial-spec. If you have a commercial-spec extension on your rifle, make sure to order the Commercial-Spec CTR. Please see the "Related Info" section above to determine which tube you have. If you happen to have one of the uncommon military tubes with an extended slant-back, along with the Mil-Spec CTR you will also need to order the Extended Rubber Butt-Pad, 0.55" (sold separately). * Friction lock performance may vary depending on the receiver extension's dimensional tolerances. ** Specifications based on standard-length (flat-back) M4 Carbine receiver extension and may vary depending on tube manufacturer. Standard Rubber Butt-Pad, 0.30" weight: 0.08 lb. Optional Extended Rubber Butt-Pad, 0.55" weight: 0.11 lb. Optional Enhanced Rubber Butt-Pad weight: 0.13 lb. CTR® Carbine Stock Technical Resources: CTR Stock Tech Note- Installation & Usage Carbine Receiver Extension Comparison Carbine Receiver Extension, Mil-Spec Detail Carbine Receiver Extension, Commercial-Spec Detail WARNING: Observe safe firearm handling practices at all times. Failure to do so may result in serious bodily injury or death. Magpul Industries shall not be responsible for injury, death, or property damage resulting from faulty installation, misuse, illegal use, or modification of this product. EXPORT NOTICE: This product and/or its components is subject to the International Traffic in Arms Regulations (ITAR, 22 CFR Parts 120-130) and export is strictly prohibited without authorization or a license issued by the U.S. Department of State's Directorate of Defense Trade Controls. Additionally, any documents or engineering drawings, prints, etc. that can be viewed, downloaded, or printed from our Web site may contain technical data which may not be exported outside of the United States, or released or disclosed to non-US persons (i.e. persons who are not US citizens or lawful permanent residents) inside of the United States, without prior written authorization by the relevant US Government agency. Violations of these export laws are subject to severe civil, criminal and administrative penalties.