B5 Systems Sierra K Flat Dark Earth AR-15 PDW Stock - Fits B5 Sierra Extension

The B5 Systems Sierra K is a purpose-driven compact buttstock engineered for PDW and compact weapon systems. Built around a reduced overall size with a slim cheek profile, the Sierra K keeps the shooter's head aligned on optics without adding the length of a full-length stock, making it a clean fit for short-barrel AR builds and personal-defense weapon platforms.

This Flat Dark Earth variant (SRK1656) is designed to mount on the B5 Systems Sierra Extension receiver extension. Functional details include a snag-free adjustment lever for length-of-pull adjustment, a limited rotation QD sling mount, integral fixed sling mounts, and internal storage compartments for keeping small items close at hand.

The Sierra K measures 5.63 in long by 1.50 in wide and stands 3.80 in tall, with a listed weight of just 6.60 oz, keeping the rear of the rifle light and unobtrusive for maneuverability.