B5 Systems Sierra K AR-15 Compact Stock - Black - Mil-Spec

The B5 Systems Sierra K stock is a purpose-driven, compact stock designed specifically for use on PDW (Personal Defense Weapon) and other compact AR-15 platforms. Its low-profile design and Mil-Spec fit make it a natural choice for short-barreled rifles, pistol-caliber carbines, and feature-driven builds where a full-length stock would be too bulky.

Measuring just 5.63 inches long, 1.5 inches wide, and 3.8 inches tall, the Sierra K keeps your build trim while delivering a solid, repeatable cheek weld. At only 6.6 ounces, it adds minimal weight to the rear of the rifle, so the host stays balanced and easy to maneuver. The low-profile adjustment is quick and intuitive, letting the shooter set length of pull without fuss.

Finished in Black, the Sierra K is built in the USA by B5 Systems and is well-suited to home-defense pistol-caliber ARs, suppressed SBRs, and any PDW-style build where compactness, control, and comfort all matter.