Kynshot Rb5000 S/S Ar-Platform
$149.99
$154.99
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The Kynshot RB5000 S/S is a hydraulic recoil buffer system engineered for AR-15 rifles using standard mil-spec carbine buffer tubes. If you run a modern AR in any popular caliber—5.56 NATO, .450 Bushmaster, 7.62x39, 6.8 SPC, 6.5 Grendel, 7.62x40 Wilson, .204 Ruger, or .350 Legend—this drop-in buffer addresses one of the platform's most common complaints: felt recoil and muzzle rise. The RB5000 clips into your existing buffer tube (internal depth 7") without modification, plays nice with any standard buffer spring, and requires zero gunsmithing.
Hydraulic buffers work by using fluid dynamics to absorb energy from the bolt carrier group as it cycles. The RB5000 is rated to reduce felt recoil by approximately 30 percent, which translates to a noticeably softer shooting experience, faster target reacquisition, and less fatigue during long range sessions or training days. Beyond comfort, smoother cycling can improve reliability across different ammunition types and powder charges—especially valuable if you're pushing the boundaries of a cartridge like 6.5 Grendel or working with budget ammunition at the range.
Installation is straightforward: remove your current buffer, drop in the RB5000, and you're done. It's compatible with any collapsible stock on the market. One important note: Kynshot explicitly advises against using the RB5000 in pistol caliber carbines (PCCs), where bolt carrier weights and cycling dynamics differ significantly from rifle platforms.
Key Features
- Drop-in replacement for any mil-spec AR-15 buffer system—no gunsmithing required
- Hydraulic dampening reduces felt recoil by approximately 30%
- Compatible with all AR-15 calibers including 5.56 NATO, .450 Bushmaster, 7.62x39, 6.8 SPC, 6.5 Grendel, 7.62x40 Wilson, .204 Ruger, and .350 Legend
- Works with any standard buffer spring
- Fits all AR-15 carbines with collapsible stocks
- Stainless steel construction for durability
Specifications
| Buffer Type | Hydraulic Recoil Buffer |
| Platform | AR-15 |
| Buffer Tube Compatibility | Mil-Spec Carbine (7" internal depth) |
| Recoil Reduction | Approximately 30% |
| Material | Stainless Steel |
| Installation | Drop-in replacement |
Frequently Asked Questions
Will the Kynshot RB5000 work with my AR-15 caliber?
Yes, the RB5000 is compatible with all AR-15 calibers, including 5.56 NATO, .450 Bushmaster, 7.62x39, 6.8 SPC, 6.5 Grendel, 7.62x40 Wilson, .204 Ruger, and .350 Legend. The only restriction is that it should not be used in pistol caliber carbines.
Can I use the RB5000 with my existing buffer spring?
Yes. The RB5000 is designed to work with any standard buffer spring, so you don't need to replace your current spring when upgrading to this hydraulic buffer.
Is installation difficult?
No. The RB5000 is a true drop-in replacement. Simply remove your existing buffer, insert the RB5000 into your mil-spec carbine buffer tube, and you're ready to shoot. No tools or modifications are required.
What's the internal buffer tube depth requirement?
The RB5000 is designed for mil-spec style carbine buffer tubes with an internal depth of 7". Make sure your AR-15 is equipped with a standard collapsible stock buffer tube before purchasing.
