The B5 Systems Enhanced SOPMOD is a collapsible carbine stock for AR-15 and M4 rifles, fitting any Mil-Spec-diameter carbine receiver extension.
The B5 Systems Enhanced SOPMOD Stock is the commercial version of the SOPMOD-pattern furniture B5 Systems is known for. The wide SOPMOD cheek weld — a pattern shooters consistently rate among the most comfortable ever fitted to a carbine — pairs with water-resistant storage compartments on both sides and ambidextrous QD sling sockets, all molded in glass-filled polymer.
On a Mil-Spec carbine extension it locks up tight and adjusts positively, giving service and hard-training rifles a rear end that takes punishment and keeps batteries dry while doing it. This is what "buy once" looks like in a carbine stock.
Key Features
- Wide SOPMOD cheek weld — comfortable and highly repeatable
- Water-resistant storage both sides — batteries and spares protected
- Ambidextrous QD sockets — sling rigging for either shoulder
- Glass-filled polymer body — dense, solid and hard-wearing
- Five colorways — Black, FDE, Coyote Brown, ODG, Wolf Gray
Compatibility & Fitment
Fits AR-15/M4 rifles running a Mil-Spec-diameter carbine receiver extension (buffer tube) — slide it on, set your length, load the compartments. Commercial-diameter tubes are oversized and will not take this stock, so check your tube specification before ordering. The QD sockets accept standard push-button quick-detach sling swivels, and the compartments seal against splash and weather rather than being fully submersible.
Technical Specifications
Platform | AR-15 / M4 |
Fits | Mil-Spec carbine receiver extension |
Type | Collapsible carbine stock with storage |
Material | Glass-filled polymer |
Finish | Black, Flat Dark Earth, Coyote Brown, Olive Drab Green, Wolf Gray |
Mount Interface | Ambidextrous QD sling sockets |
Brand | B5 Systems |
US Shipping & Support
Shipped from D&R Sports Center in the USA with fast, tracked delivery. Questions on fit, mounting or which model suits your setup? Our team is glad to help before and after your purchase.
Frequently Asked Questions
Does the Enhanced SOPMOD fit a standard carbine tube?
It fits AR-15/M4 rifles running a Mil-Spec-diameter carbine receiver extension. Commercial tubes are oversized and will not take this stock, so check your tube specification before ordering. Measuring the tube is the quickest way to be sure if the rifle came to you secondhand.
What do I get with the Enhanced SOPMOD that a plain stock does not have?
It has water-resistant storage compartments in the body for batteries, small spares or a cleaning kit, and QD sockets built in for sling attachment. The body is glass-filled polymer, which is what gives it the solid, dense feel compared with lighter moldings. It is the fuller-featured stock in the B5 line rather than the minimalist option.
How do the QD sockets and compartments work in practice?
The QD sockets take standard push-button quick-detach sling swivels, so you can move the sling from side to side depending on how you shoot. The compartments seal against splash and weather rather than being fully submersible, so treat them as somewhere to keep spares dry rather than a waterproof case. Both features add a little bulk over a slimline stock, which is the trade-off.
Which colors are there and how does it compare with the Bravo?
Black, Flat Dark Earth, Coyote Brown, Olive Drab Green and Wolf Gray are offered. If you would rather have a slim, snag-free stock without compartments, the B5 Bravo stock is the lighter alternative on the same tube.
