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This is the stock that put B5 Systems on the map. Since 2011 they have built the Crane NSWC-designed SOPMOD buttstock for the U.S. Department of Defense, and the GOVT version is that exact issue configuration offered up for the rest of us. No commercial branding, no extra bells and whistles, just the sloped cheek weld and sealed storage that soldiers have carried in the field for years. If you have ever handled an issued M4A1, this is the piece you were resting against.
The big thing to understand before you buy: this Government Issue model does not have a QD sling socket, and it skips the commercial logo. That is by design. It is the Gen 1 spec, which is precisely why clone builders reach for it. If you are putting together a Block 1 or URGI-style rifle and want it to look and feel correct, the GOVT SOPMOD is the right call. The Enhanced version adds the anti-rotation QD mounts and B5 markings, so if you specifically want QD attachment points, that is the one to look at instead.
Made in the USA from mil-spec materials and finishes, this stock fits any mil-spec diameter carbine receiver extension. It runs on the tighter side, which is a good thing, and folks consistently report zero wobble or rattle once it is on the tube. The sloped profile gives you a natural, repeatable cheek weld that helps you get behind the optic the same way every time, and the cushioned rubber buttpad keeps it planted on the shoulder. Dual water-resistant compartments handle spare CR123 batteries or small gear, and color-matched steel hardware keeps everything looking clean.
Bottom line, this is a proven, no-nonsense buttstock with real military lineage. Whether you are running it hard in training or building something that mirrors the real deal, it delivers the same feel the pros have relied on.
The GOVT (Government Issue) version is the true military-spec Gen 1 configuration, which means it has no QD sling socket and no commercial logo. The Enhanced version adds anti-rotation QD sling mounts and B5 branding. If you want QD attachment points, go with the Enhanced; if you want the authentic issued look for a clone build, the GOVT is the one.
It fits any standard mil-spec diameter carbine receiver extension (buffer tube), which covers the vast majority of AR-15 builds. It does not fit commercial-diameter tubes. Owners routinely mention it goes on snug with no wobble, so if you have a mil-spec tube you are good to go.
Yes. It includes dual water-resistant compartments that are perfect for stashing spare CR123 batteries or other small gear. This storage feature is part of the original SOPMOD design that came from special forces wanting to carry extra batteries on the weapon itself.
It is the same government-issue design B5 Systems has produced for the Department of Defense since 2011, built to mil-spec standards and made in the USA. This is why it is a top pick for accurate clone builds like Block 1 and URGI rifles. You are getting the genuine article rather than a commercialized copy.
| UPC | 814927022447 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | SOP-1351 |
| Length | 9.7000 |
| Color | Black |
| Model | |
| Product Type | Stock |
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