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The RB5004 is a hydraulic recoil buffer built specifically for AR-10 carbine setups running M4-length buffer tubes, which are common on modern .308 rifles from manufacturers like DPMS and CMMG. The 2.5-inch shorty design fits rifles with collapsible stocks, making this a drop-in replacement for factory buffers. Unlike standard buffers that just slow down the bolt, the RB5004 uses a patented damping system that actively absorbs the recoil impulse as the bolt carrier moves rearward. This means the cycling is smoother and more controlled throughout the entire stroke.
What sets hydraulic damping apart is how it handles the .308 platform's heavy recoil. The buffer reduces felt recoil in the 20-30% range while largely eliminating muzzle flip. That matters more than numbers might suggest because it means your sight picture stays cleaner between shots. Whether you're running rapid fire drills or just trying to get faster follow-ups at the range, you'll notice the difference in how quickly you can get back on target. The bolt bounce that normally happens during chambering is also suppressed, so mechanical reliability stays solid even with higher-pressure loads.
The shorty design makes the RB5004 work with any standard AR-10 buffer spring, and installation takes minutes. Just swap out your existing buffer and you're done. It's important to note this is not for 9mm AR-15s or other pistol caliber builds, which require different models. The RB5004 pairs well with rifles running .308 Winchester, 7.62 NATO, and similar calibers built on the .308 case including .338 Federal, .260 Remington, and .243 Winchester as long as they have an M4-length tube.
The buffer is constructed from 17-4 stainless steel, which resists corrosion and holds up to repeated use without degrading. It's built to handle temperatures from -30F to 150F, so whether you're shooting in winter or running hot stages at the range, the hydraulic fluid inside stays effective. KynSHOT backs the RB5004 with a 10-year conditional warranty covering 1 million rounds, which shows confidence in durability. Made in the USA with military-grade materials and manufacturing standards.
The RB5004 is the shorty model designed for AR-10 carbines with M4-length (7-inch internal) buffer tubes and collapsible stocks. KynSHOT makes longer versions like the RB5005 for standard 7.75-inch AR-10 tubes and the RB5006 for fixed-stock rifles. Choosing the right model depends on your tube length and stock type, as using the wrong size can cause cycling or mechanical issues.
Yes, the RB5004 works with any standard AR-10 buffer spring. It's a direct drop-in replacement, so you can keep your existing spring or upgrade to an aftermarket option if you want to fine-tune cycling even more. No special springs are required for basic functionality.
The RB5004 reduces felt recoil by 20-30% compared to standard buffers. More importantly, it nearly eliminates muzzle flip and suppresses bolt bounce, which makes a noticeable difference in rapid-fire accuracy and how quickly you can get follow-up shots on target. The effect is felt throughout the shooting experience, not just downrange statistics.
No, the RB5004 is not designed for 9mm AR-15s or pistol caliber builds. KynSHOT makes dedicated models for those platforms like the RB5007 and RB5015HD. Using the wrong buffer can cause feeding, cycling, or mechanical damage to your rifle.
| UPC | 854476005027 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RB5004 |
| Color | Silver |
| Length | 7.9500 |
| Model | |
| Product Type | Buffer |
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