KYNSHOT - Hydraulic Buffer for 9mm Short Stroke PCC The RB5020SS Short Stroke Hydraulic Recoil Buffer, for AR-15 9mm Short Stroke competition applications.
*Recommended to be used with A5/AR10 carbine length buffer tubes
Get the soft recoil impulse and quick sight recovery you’re looking for in your ultimate competition PCC AR15. The RB5020SS buffer provides longer length and more weight for those who desire a short stroke competition action. With a length of 5.3”, this buffer will shorten the stroke of the bolt by 1.3” compared to our standard 9mm buffer when installed in a standard AR15 carbine buffer tube1. This is normally a shorter bolt stroke than most AR 9mm builds will function with and is therefore not recommended. When this buffer is installed in an A5/AR10 carbine length buffer tube this buffer will shorten the stroke of the bolt by .55”, which can be increased by the addition of spacers2. Using this buffer in an AR10/A5 length carbine buffer tube is the recommended set up. AR15 carbine buffer tubes are 7" long on the inside. A5/AR10 carbine buffer tubes are 7 3/4" long on the inside. The damping level of this buffer is intended for lighter, low power factor, competition type 9mm ammunition loads for best performance and longest service life.
1This may require a modified bolt in order to properly reset the trigger.
2This method is recommended when using an unmodified bolt in order to ensure a long enough bolt stroke for reliable trigger function.
* Recommended buffer spring to use with this buffer and a 16" barrel is a JP .308 Rifle Buffer Spring (JPS-OSR-308). If shooting a PCC with a short barrel, a lighter spring may be required. 308 Carbine Buffer Springs such as the JP .308 Carbine Buffer Spring (JPS-OSC-308) or Sprinco Orange (SPRINCO-25762) are slightly less powerful and also work well on a lot of builds.
Weight: 7.5 OuncesLength when Compressed: 5.3"Mil-Spec Hydraulic Fluids and Seals - Ambient operating temp certified for -30F - +150F
Made in USA ITAR Product - export of this product is strictly prohibited without a valid export license issued by the U.S. Department of State, in accordance with International Traffic in Arms Regulations (ITAR). Purchase of this product is restricted to U.S. Persons who do not intend to export this product or businesses with a valid export license operating in compliance with all applicable ITAR regulations.
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What is the best buffer and spring set up for my 9mm AR PCC with a 5” barrel with a Shroud to make it 16” for competition as a short-stroke system?
Use one of two combinations:
The Springs are stronger because this is a short stroke set up and the bolt needs to slow down faster.
What is the best buffer and spring set up for my 9mm AR PCC with a 5” barrel with a Shroud to make it 16” for competition as a full-stroke system?
Use an RB5007 Standard Damped 9mm buffer and a Sprinco Red or other extra power .223 carbine buffer spring. Sometimes trial and error is necessary with buffer spring selection with various loads to find the sweet spot of performance and feel.
What is the best buffer and spring set up for my 9mm AR PCC with a 16” barrel for competition as a full-stroke system?
Use the RB5015HD High Damped 9mm buffer and .308 carbine buffer spring in a standard carbine buffer tube or use the same buffer and spring plus the PCC buffer weight in an A5 buffer tube for a slightly smoother/softer system.
What is the best buffer and spring set up for my 9mm AR PCC with a 16” barrel?
Use an RB5015HD (High Damped) 9mm buffer and a .308 carbine buffer spring such as a Sprinco Orange or JP .308 carbine spring.
What is the best buffer and spring set up for my 9mm AR PCC with an 8-11” barrel?
What is the best buffer and spring set up for my 9mm AR PCC with a 5” barrel?
Use an RB5007 (Standard Damped) 9mm buffer and an extra power .223 carbine buffer spring such as the Sprinco Red. If you run it with heavy subsonic bullets and a suppressor, then you may find that a JP .308 carbine spring works and runs with less spring noise. If your gun happens to cycle on the soft side, then you can use the JP .223 carbine spring in order to get less spring noise. The JP .223 carbine spring is slightly less powerful than the Sprinco Red spring.
What is the best buffer and spring set up for my CMMG Radial Delayed Blowback 9mm AR PCC?
Use an RB5005 AR10 Carbine Buffer or RB5000HP High Pressure AR15 Carbine Buffer with a Sprinco Red AR15 Extra Power Carbine Buffer Spring.
What is the best buffer and spring set up for my 45 ACP AR PCC?
Use an AR10/A5 carbine buffer tube and use an RB5015HD High Damped 9mm Buffer, PCC Buffer Weight and a JP .308 rifle buffer spring.
What is a hydraulic buffer in an AR-15?
A hydraulic buffer in an AR-15 is a specialized component designed to replace the traditional buffer in the firearm's recoil system. As an expert in AR-15s, I can tell you that the primary purpose of a hydraulic buffer is to improve the overall shooting experience by reducing felt recoil, minimizing bolt carrier movement, and dampening vibrations.
The hydraulic buffer functions using a piston filled with hydraulic fluid, which compresses as the bolt carrier moves rearward during the cycling of the firearm. This hydraulic compression absorbs the energy generated by the recoiling action, reducing the force felt by the shooter and allowing for faster follow-up shots.