Description
You’re clearing a structure. The hallways are tight, corners are blind, and every ounce matters. You need a tool that’s compact, hits with authority, and won’t snag when seconds count. That’s the mission profile for the Maxim Defense MDX510-C 7.62x39mm, 10.3″ Barrel, Arid, Gen 7 CQB Stock. It’s a purpose-built, short-barreled rifle (SBR) configured from the factory for close-quarters dominance, chambered in the hard-hitting 7.62x39mm cartridge. With an overall length of just 26.5 inches collapsed, it delivers rifle-caliber power in a package barely larger than a submachine gun.
When it comes to home defense or vehicle-based operations, over-penetration and maneuverability are primary concerns. The 7.62x39mm, especially with proper defensive ammunition, offers a compelling balance of stopping power and barrier-blind performance. The MDX510-C’s 10.3-inch barrel is optimized for this round, ensuring reliable cycling and effective velocity from a compact system. This isn’t a chopped-down rifle; it’s an engineered solution where every component, from the gas system to the stock, is selected for this specific role. The result is a weapon that fits out of the box, requiring no gunsmithing to achieve reliable, hard-use performance.
Key features start with the Gen 7 CQB Stock. Maxim Defense’s proprietary design provides multiple locking positions for a secure cheek weld and shouldering, all while maintaining an incredibly slim profile that won’t catch on gear. The stock pairs with Maxim’s tuned hydraulic buffer system to manage the substantial recoil impulse of the 7.62x39mm in a short gas system, making follow-up shots faster and more controlled. The Arid finish isn’t just for looks—it’s a durable, ceramic-based coating that provides serious corrosion resistance and a non-reflective surface ideal for low-light conditions.
The upper receiver group is built around a robust, cold hammer-forged 4150 CMV barrel with a 1:9.5″ twist rate, capped with a Maxim Defense MD-62 3-prong flash hider. The handguard is a slim, free-float M-LOK design offering ample real estate for lights, lasers, and grips without adding bulk. Internally, the bolt carrier group is specifically engineered for the 7.62x39mm cartridge, enhancing reliability with both steel and brass case ammunition. This rifle is compatible with standard AR-15 lowers chambered in 7.62x39mm, giving you flexibility in your build. At a price of $2345.30, you’re investing in a complete, optimized system, not just parts.
| Caliber | 7.62x39mm |
|---|---|
| Barrel Length | 10.3 inches |
| Overall Length (Collapsed) | 26.5 inches |
| Weight (Unloaded) | 6.8 lbs |
| Finish | Arid (Cerakote) |
| Stock | Maxim Defense Gen 7 CQB |
Pros: Delivers rifle-caliber performance in an ultra-compact SBR platform. The engineered buffer system tames recoil effectively. The Arid finish and slim profile are ideal for tactical use. Comes as a complete, reliable upper assembly ready to mate with your lower.
Cons: The premium engineering commands a premium price point. As an NFA item (Short-Barreled Rifle), it requires proper paperwork, a tax stamp, and approval time before taking possession. Magazine options are specific to the 7.62x39mm AR platform.
So who is this for? It’s for the serious end-user who understands the advantages of a compact, large-caliber weapon system for defensive or duty use. It’s for the shooter who values engineered solutions over improvised builds and demands reliability from a firearm that may be called upon in critical moments. This platform is available at firearms-missouri.com for Missouri residents and nationwide, following all applicable NFA regulations.
Frequently Asked Questions
Q: What lower receiver does this work with?
A: The MDX510-C upper assembly is designed to work with standard mil-spec AR-15 lowers that are specifically built for the 7.62x39mm cartridge. You’ll need a compatible lower, a 7.62x39mm-specific bolt catch, and magazines like those from C-Products Defense.
Q: Is this a complete rifle?
A: This is a complete upper receiver assembly with the Maxim Defense stock and buffer system. It is not a complete firearm. To build a functioning SBR, you must pair it with a registered 7.62x39mm lower receiver. Remember, FFL transfer and NFA tax stamp approval are required for the completed firearm.
Q: How does the recoil compare to a full-length AK or AR?
A: The recoil is more pronounced than a 5.56mm AR but is remarkably manageable for a 7.62x39mm SBR. The secret is Maxim’s hydraulic buffer system in the Gen 7 stock—it doesn’t eliminate the push, but it smooths it out dramatically, making rapid, accurate shots feasible. Here’s the thing—it feels controlled, not chaotic.
If your requirements align with a professional-grade, compact 7.62x39mm system, the Maxim Defense MDX510-C is a definitive answer. Explore the details and compliance steps on our product page.
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