The Kynshot RB5000HP is a hydraulic recoil buffer engineered specifically for over-gassed AR-15 rifles and CMMG radial delayed blowback systems. If you've added a suppressor to your AR or run a larger caliber like .458 SOCOM, .450 Bushmaster, or .50 Beowulf, you know the extra back pressure can pound your shoulder and beat up reliability. This buffer tackles that problem with enhanced damping designed to absorb the punishment of hard-cycling, pressurized systems.

The RB5000HP drops straight into your existing carbine buffer tube setup—no gunsmithing required. It works with any standard buffer spring and is fully compatible with mil-spec internal dimensions (7" depth). The hydraulic design does the heavy lifting: it reduces felt recoil by roughly 30% and helps your rifle run more reliably under demanding conditions. Whether you're running a can or pushing heavy rounds downrange, this buffer keeps the bolt from slamming back into the receiver with the force of a sledgehammer.

Worth noting: while the standard RB5000 handles suppressed guns and large calibers fine, the HP variant is optimized for rifles that are genuinely over-gassed and need that extra damping muscle. One caveat—don't use this in a PCC (pistol caliber carbine). This is purpose-built for centerfire rifle systems that are working harder than they should be.

Key Features

• Hydraulic damping reduces felt recoil by approximately 30%
• Drop-in replacement—fits any standard buffer system
• Optimized for suppressed and over-gassed AR-15 platforms
• Enhanced damping properties handle large-bore calibers (.458 SOCOM, .450 Bushmaster, .50 Beowulf)
• Compatible with CMMG radial delayed blowback systems
• Works with any style buffer spring
• Improves reliability in hard-cycling rifles

Specifications

Brand	Kynshot
Model	RB5000HP
Buffer Tube Compatibility	Mil-spec carbine (7" internal depth)
System Type	Hydraulic recoil buffer
Designed For	Over-gassed AR-15, suppressed AR-15, CMMG radial delayed blowback, large-bore calibers
Recoil Reduction	Approximately 30%
Not Recommended For	Pistol caliber carbines (PCC)

Frequently Asked Questions

Will the RB5000HP work with my suppressed AR-15?

Yes. The RB5000HP is specifically designed to handle the added back pressure created by a suppressor. Its enhanced damping is built for this application.

Can I use this buffer in a large-caliber AR like a .458 SOCOM or .450 Bushmaster?

Yes. The RB5000HP is engineered to handle large-bore calibers and their higher pressures. The standard RB5000 will also work with these calibers, but the HP version provides more damping if your rifle is running over-gassed.

Is this a drop-in replacement for my current buffer?

Yes. The RB5000HP fits any mil-spec carbine buffer tube and works with any standard buffer spring. No tools or modifications needed.

Can I use the RB5000HP in a pistol caliber carbine?

No. Kynshot does not recommend using this buffer in PCC platforms.