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The Armaspec SRS H3 Gen 4 bundles everything needed to mount a stock onto your AR-15 lower receiver. It comes complete with a six-position mil-spec 7075-T6 aluminum buffer tube, steel castle nut, end plate, and Armaspec's advanced SRS Stealth Recoil Spring system. This is a ready-to-install package that works with standard AR-15 mil-spec interfaces, so you're not hunting for compatibility.
The SRS GEN4 spring assembly is where this kit stands out. Instead of a traditional buffer rattling inside the tube, Armaspec's multi-stage design keeps the spring from grinding against the inner walls, which means smoother operation and noticeably quieter cycling. The spring is self-contained, so it's a true drop-in replacement that reduces spring noise without modification.
The H3 buffer weighs 5.6 ounces, making it one of the heavier carbine-compatible options. This extra mass is built to handle overgassed rifles, suppressed shooting, or setups that cycle too fast. The H3 slows the bolt carrier group down, which translates to reduced felt recoil, less muzzle rise, and less wear on internal parts. If your rifle is running hot or you're looking to tame sharp recoil without an adjustable gas block, this weight does the job.
The aluminum tube is made from mil-spec 7075-T6, the same material used in quality AR buffers, and all hardware is steel. The six-position adjustability lets you dial in your cheek weld and sight line without changing the internal mechanics. Armaspec backs this kit with a lifetime warranty, so you're covered if anything fails.
Armaspec's SRS uses a multi-stage design that keeps the spring from rubbing against the inside of the buffer tube, which cuts noise and creates smoother cycling. A traditional buffer spring rattles around inside the tube, creating that metallic twang and causing friction that can wear components faster. The SRS is self-contained, so you get quieter operation without needing modifications.
H3 buffers work best in setups that run hot, such as overgassed rifles, suppressed builds, or short barrels. If your rifle cycles smoothly with a lighter buffer and locks back reliably, there's no need to go H3. If you're seeing sharp recoil, forward brass ejection, or the action cycling too fast, H3 will smooth all that out. The key is matching the weight to your specific gun and ammo.
Yes, this kit is mil-spec compatible and works with any standard AR-15 lower receiver that takes a carbine-length buffer tube. The castle nut and end plate screw onto the rear takedown pin hole using the standard mil-spec mounting interface, so installation is straightforward without any special tools or modifications.
Armaspec's lifetime warranty covers manufacturing defects and workmanship issues, which means if the component fails due to a flaw in how it was made, Armaspec will repair or replace it. Normal wear from thousands of rounds is different from a manufacturing defect, so clarity on what you're seeing in your specific situation matters. If something breaks or stops working as intended, reach out directly to Armaspec with proof of purchase.
| UPC | 810048492862 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM263-H3 |
| Product Type | Buffer Tube Complete Assembly |
| Model | |
| Color | Black |
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