Magpul

-Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such asColt, LMT, Ruger, S&W, SIG, and others (please see the note below)-Sloping cheek weld combines a slim profile with user comfort-Dual-side release latch provides easy adjustment while remaining anti-snag-Premium chrome-silicon lock spring provides positive locking & long service life-Compact rubber butt-pad offers an anti-slip surface & increases impact protection-Rollover on the toe allows for easier shoulder transitions & better fit when using body armor-Compatible with Magpul ASAP®, ASAP® QD, & other receiver-mount sling attachments-1.25” Footman’s Loop for sling mounting, & also accepts the M-LOK QD Sling Mount for push-button sling attachment (sold separately)Note: There are two basic sizes of M4 Carbine receiver extensions (buffer tubes): mil-spec & commercial-spec. The MOE SL-K will only fit the common mil-spec tube.