CTR™ M4 Carbine Collapsible Buttstock – Military Model The patent-pending Magpul® CTR™ (Compact / Type Restricted – Military Model) is a drop-in replacement butt stock for carbines using mil-spec 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 eliminates wobble* for enhanced weapon stability and accuracy. The Military Model includes a standard 0.30” rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear. Note: There are two basic types of M4 Carbine Receiver Extensions (buffer tubes): Mil-Spec and Commercial. If you have a Commercial extension on your rifle, make sure to order the Commercial CTR™ (MAG311). If you have one of the uncommon military tubes with an extended slant-back, please contact Magpul for an Extended 0.55” Rubber Butt-Pad (sold separately). For help identifying which extension is on your rifle, click here. Made in USA Features Ø Mounts on Military Carbine Receiver Extension tube (Not included) Ø Premium chrome-silicon lock spring provides positive locking and long service life Ø Supplemental friction lock eliminates accuracy robbing wobble* Ø Sloping cheek weld combines a slim profile with user comfort Ø Shielded release latch prevents snagging and accidental operation Ø Side mounting slots accept optional cheek risers for NON-AR15 / M16 applications Ø Compatible with Single-Point® sling mounts Ø Sling Mounts o Rear - Push-button QD sling mounts accommodate up to 1.5” swivels (Ambidextrous) o Rear / Bottom - 1.25” Sling loops o Toe - Lanyard hole for custom para-cord rigs Included Accessories** Ø Rubber Butt-Pad, 0.30” (Removable) Optional Accessories** Ø Extended Rubber Butt-Pad, 0.55” Ø Cheek Risers (0.25”, 0.50”, 0.75”, 1.5”for NON-M16 applications) Specifications*** Ø CTR™ Military Carbine Stock (w/ Butt Cap) o Weight, Stock Body: 0.48 lb. o Weight, w/ Receiver Extension: 0.79 lb. o Length, Stock Body: 6.60 in. o LOP Adjustment Range: 3.3 in. o LOP, M4 Collapsed: 10.1 in. o LOP, M4 Extended: 13.4 in. * Friction lock performance may vary depending on the receiver extension’s dimensional tolerances. ** Mounting Standard Rubber Butt-Pad adds 0.30 in. LOP and 0.09 lb. Optional Extended Rubber Butt-Pad, 0.55” adds 0.25 in. LOP and 0.02 lb. vs. standard pad and may be used with either extended-length (slant-back) or standard-length (flat-back) M4 Carbine Receiver Extensions. Butt-pads are compatible with UBR™, ACS™, CTR™ and MOE™ carbine stocks. *** Specifications based on standard-length (flat-back) M4 Carbine Receiver Extension and may vary depending on tube specifications.