Description
The SOPMOD is one of those designs that earned its reputation the hard way, in the field. B5 Systems has been building the Crane NSWC-designed SOPMOD buttstock for the U.S. Department of Defense since 2011, and the SOP-1352 is that exact stock made available to the rest of us. It carries the sloped, wide cheek profile the platform is known for, which is really the whole point of the thing. When your face lands on it the same way every time, your sight picture comes together faster and stays consistent shot to shot.
What the SOPMOD Government Stock Brings to Your Build
This is the government version, so it keeps things straightforward. You get color-matched steel hardware, fixed sling mounts, and a no-slip cushioned buttpad that grabs your shoulder and holds position instead of sliding around under recoil or when you shift positions. The whole stock is made from mil-spec materials and finishes, so it feels solid with no rattle once it's locked onto the tube. Coyote Brown is a versatile earth tone that blends nicely with FDE and tan furniture, or gives a subdued look against a black rifle.
Storage Built Into the SOPMOD Buttstock
One of the features that made this stock famous is the pair of water-resistant compartments molded into the body. They were originally added so operators could carry spare CR123 batteries for optics and lasers right on the gun, and each side holds roughly three CR123s or other small odds and ends. It's genuinely handy for a spare battery, earpro tips, or a small cleaning item, and the added width from those compartments is a big part of why the cheek weld feels so good.
Fitment and Real-World Use
The SOP-1352 fits standard mil-spec diameter carbine receiver extensions. It weighs in right around 11.8 ounces and runs about 7.4 inches long, so it's a substantial, no-nonsense stock rather than a stripped-down lightweight. If you're after that authentic issued look for a clone build, or you just want a proven, comfortable stock that shoulders well and carries a little gear, this one delivers. Made in the USA.
Key Specifications
- Manufacturer: B5 Systems
- Model: SOPMOD (Government Version)
- Manufacturer Part Number: SOP-1352
- UPC: 814927022454
- Color: Coyote Brown
- Material: Mil-Spec Polymer
- Fitment: Mil-Spec Carbine Receiver Extension
- Weight: 11.8 oz
- Length: 7.4 in
- Height: 4.9 in
- Sling Mounts: Fixed Sling Mounts
- Storage: Dual Water-Resistant Compartments
- Buttpad: No-Slip Cushioned
- Hardware: Color-Matched Steel
- Country of Origin: Made in USA
What’s Included
- B5 Systems SOPMOD Government Version buttstock (Coyote Brown)
Frequently Asked Questions
What buffer tube does the B5 SOPMOD stock fit?
The SOP-1352 is built for standard mil-spec diameter carbine receiver extensions, which is the most common tube on AR-pattern carbines. It slides right onto a mil-spec tube with a snug, rattle-free fit. It will not fit commercial-diameter tubes, so check what you have before ordering.
What's the difference between this government SOPMOD and the Enhanced SOPMOD?
This government version keeps things simple with fixed sling mounts and the classic SOPMOD profile. The Enhanced SOPMOD adds B5's one-piece anti-rotation QD sling mounts and a suregrip stock latch on top of the same cheek weld and storage. Both share the same comfortable, wide profile, so it really comes down to whether you want QD sling attachment points.
What can you actually store in the SOPMOD compartments?
The two water-resistant compartments were designed to carry spare CR123 batteries for optics and lasers, and each side holds around three CR123s. Beyond batteries, they work well for small items like earpro tips or a compact tool. The extra width those compartments create is also a big reason the cheek weld feels so solid.
Is the B5 SOPMOD stock the same one used by the military?
It follows the Crane NSWC-designed SOPMOD buttstock, and B5 Systems has produced that stock for the U.S. Department of Defense since 2011. This government version is that same design made available to the public. It's a popular pick for anyone building an issued-style or clone rifle.





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