The B5 Systems Sierra K Compact PDW Stock in OD Green is a purpose-driven compact stock built for PDW and other compact weapon systems (brand part no. SRK-1658). It cuts overall size with a slim cheek profile, a snag-free adjustment lever, limited-rotation QD sockets and integral fixed sling mounts. Internal tensioners and an anti-slip buttpad keep it solid against the shoulder, and the color-matched steel hardware is finished to mil-spec standards. It mounts on a shortened compact mil-spec receiver extension, which makes it a natural fit for short, handy builds where every inch counts.

Key Specifications

• The color is OD Green, with steel hardware matched to the stock so the whole assembly reads as one piece.
• Overall length is 5.63 inches, a compact footprint that suits PDW-style builds.
• Width is 1.5 inches, which keeps the stock narrow at the shoulder.
• Height is 3.8 inches, giving the cheek and buttpad a usable area without adding bulk.
• Weight is 6.6 ounces, light enough to keep a short carbine well balanced.
• Adjustment is handled by a low-profile, snag-free adjustment latch that stays out of the way of gear and clothing.
• The cheek rest is a slim-profile ergonomic cheek weld, shaped to stay compact without losing a comfortable face position.
• Sling options are ambidextrous fixed sling mounts plus limited-rotation QD mounts, so either shoulder and most sling styles are covered.
• Materials and finishes are mil-spec, with color-matched steel hardware for durability in hard use.
• Mounting is through the Sierra K Receiver Extension Kit, a shortened compact mil-spec extension that lets the stock reach its full collapsed position.

Frequently Asked Questions

What does the Sierra K stock mount on? It mounts through the shortened compact mil-spec receiver extension in the Sierra K Receiver Extension Kit, which B5 Systems sells separately.

Will it fully collapse on a standard buffer tube? No. B5 Systems notes that installing the stock on a standard-length mil-spec buffer tube will not let it collapse fully, so the compact extension is the right pairing.

Does it include sling attachment points? Yes. It has ambidextrous fixed sling mounts and limited-rotation QD mounts built into the stock.

Buy the B5 Systems Sierra K Compact PDW Stock, OD Green

Compact builds live or die on how little the stock adds, and the Sierra K was designed around that goal in a color that matches OD Green setups. Order it from our Lubbock, Texas gun shop for fast, direct shipping, and browse more AR braces and stocks while you are here.