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Big bore AR builds hit different, and the standard buffer and spring that came with your lower usually can't keep up with the recoil of rounds like .458 SOCOM, .450 Bushmaster, or .50 Beowulf. That's exactly the gap this kit fills. The Armaspec SRS-BB Buffer Kit is a complete stock-mounting assembly that swaps in the company's Stealth Recoil Spring in the Big Bore weight, giving you a smoother, more controlled cycle when you're running the heavy stuff.
At the heart of the kit is the Stealth Recoil Spring, a self-contained multi-stage unit that replaces your standard buffer and spring in one piece. Instead of a loose spring rattling around inside the tube, the SRS keeps the spring from rubbing against the inner wall, so operation stays quiet and the felt recoil gets knocked down by the second stage. The buffer mass rides under constant tension against the bolt carrier, which cuts down on the wobble and slop you feel with a traditional setup. Folks who've run these describe the difference as taking a rifle from clattery to more like a sewing machine, straight back and straight forward with less muzzle flip.
This is the full package for mounting a stock to your AR-15 lower. You get a mil-spec 7075-T6 aluminum 6-position buffer tube, a steel castle nut, and a steel end plate, plus the SRS Gen 4 Big Bore recoil system already assembled. The Big Bore version carries a 5.7 oz equivalent weight (roughly 7.5 oz actual system weight), which is the heavier end of Armaspec's lineup and the reason it pairs so well with hard-recoiling calibers.
Installation is genuinely drop-in and works with most mil-spec receivers. The Gen 4 design ditched the o-ring on the weight and swapped the old screw for a roll pin and a machined cap to clean up potential failure points. You can run it with or without a buffer retainer, and a lot of people skip the retainer since the SRS stays under tension on its own, which makes future maintenance easier. Armaspec builds these in the U.S.A. and backs them with a lifetime warranty.
BB stands for Big Bore, Armaspec's heaviest AR-15 SRS weight at a 5.7 oz equivalent. It's designed for large-caliber builds like .458 SOCOM, .450 Bushmaster, and .50 Beowulf that generate a lot more recoil than a standard 5.56. The extra mass helps slow the bolt carrier down and smooth out the cycle so the rifle stays controllable.
Yes. The Stealth Recoil Spring replaces your standard buffer and spring as a single self-contained unit, and it works with most mil-spec receivers. You can run it with or without a buffer retainer, and many people skip the retainer since the SRS stays under tension on its own, which makes cleaning and maintenance simpler down the road.
It's a complete stock-mounting package. You get a mil-spec 7075-T6 6-position buffer tube, a steel castle nut, and a steel end plate, plus the fully assembled SRS Gen 4 Big Bore recoil system. That covers everything you need to attach a stock to an AR-15 lower receiver.
The Gen 4 design removed the o-ring from the weight and replaced the old screw with a roll pin, along with a machined cap and a washer in place of the snap ring. Those changes were made to eliminate potential failure points and improve long-term durability. Armaspec builds the SRS in the USA and backs it with a lifetime warranty.
| UPC | 810048492879 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM263-BB |
| Color | Black |
| Model | |
| Product Type | Buffer Tube Complete Assembly |
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