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Big-bore AR builds come with big recoil, and the standard buffer system isn't designed to handle that kind of punishment with any finesse. The Armaspec Stealth Recoil Spring Big Bore Gen4 is engineered specifically for cartridges like .458 SOCOM, .450 Bushmaster, and .50 Beowulf where felt recoil and cycling consistency matter. This is a self-contained, multi-stage system that replaces both your buffer and spring in one drop-in package.
What sets the Stealth apart from a basic buffer swap is the engineering. The multi-stage spring design cushions recoil more progressively than a single-stage spring, so you get a softer impulse rather than the sharp hammer-like thump you get from mil-spec setups. The buffer mass stays under constant tension against the bolt carrier, which means better reliability across your ammo spectrum. There's no constant rubbing of the spring against the inside of the tube like you get with traditional setups, which translates to less noise and smoother action overall. You'll notice the difference immediately when cycling the bolt by hand.
At 5.7 ounces equivalent weight, this unit is purpose-built for the recoil signature of heavy magnum calibers. It works with standard AR-15 carbine-length buffer tubes and installs without any gunsmithing. The system keeps constant pressure on the rear of the bolt carrier for consistent lock-up and feeding, which is critical when you're running larger diameter cartridges through your platform. Whether you're building a precision rifle or a hard-hitting hunting platform, the weight is dialed in for these calibers.
That annoying twang you hear when racking the charging handle or firing? It's gone. The two-stage spring design eliminates the noise signature of a traditional coil spring rattling in the tube. This becomes more noticeable if you're running a suppressor, where every bit of noise reduction counts. A rubber o-ring isolates the buffer mass from direct metal-on-metal contact, another layer of noise mitigation that makes a real difference whether you're at the range or in the field.
This is the latest Gen 4 version with improved internal geometry. Made in the USA and backed by a lifetime warranty, so you can confidently drop this into your build knowing Armaspec stands behind the product.
This Gen 4 Big Bore version is specifically tuned for .458 SOCOM, .450 Bushmaster, and .50 Beowulf. Armaspec makes other weights for standard 5.56/223, intermediate calibers, and 9mm builds. Using the wrong weight for your platform and cartridge can affect cycling and reliability, so match the weight to your build.
Yes, the self-contained design keeps the buffer mass under constant tension on the bolt carrier, so it eliminates the need for a buffer retainer in new builds. You can install it with or without a retainer depending on your build preference. Most people skip the retainer for easier maintenance.
The multi-stage spring design delivers a smoother, more progressive recoil impulse rather than the mechanical thump of a single-stage spring, and you'll get noticeable noise reduction. Recoil reduction is more subtle than sound reduction, but combined with the improved cycling and durability, it makes a tangible difference in how the rifle feels to shoot.
The Gen 4 removed the o-ring from the weight and changed the assembly design for improved reliability. The screw now uses a roll pin across the plastic end piece, and the snap ring was replaced with a washer. These changes were made to eliminate potential failure points while maintaining the core performance benefits.
| UPC | 810048492794 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM253-BB |
| Color | Black |
| Length | 10.9500 |
| Model | |
| Product Type | Buffer |
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