The patent-pending Magpul CTR (Compact/Type Restricted) – Mil-Spec 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 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.
Note: There are two basic types of M4 Carbine receiver extensions (buffer tubes): mil-spec and commercial-spec. If you have a mil-spec extension on your rifle, make sure to order the Mil-Spec CTR:
* Friction lock performance may vary depending on the receiver extension's dimensional tolerances.
** Specifications based on extended-length (slant-back) M4 Carbine receiver extension and may vary depending on tube manufacturer.
Extended Rubber Butt-Pad, 0.55" weight: 0.12 lb. Optional Rubber Butt-Pad, 0.30" (weight: 0.09 lb.) and Extended Rubber Butt-Pad, 0.70" (weight: 0.15 lb.) may ONLY be used with standard-length (flat-back) M4 Carbine receiver extensions.