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Reviews & Ratings for KynSHOT AR-15 5.56/.223 Sub-Sonic and 300 Blackout Hydraulic Recoil Buffer — 10 reviews

(10 reviews)
KynSHOT AR-15 5.56/.223 Sub-Sonic and 300 Blackout Hydraulic Recoil Buffer
KynSHOT AR-15 5.56/.223 Sub-Sonic and 300 Blackout Hydraulic Recoil Buffer
$154.99 $149.99 Save $5.00
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Most Helpful Positive Review perfect for any 300 blackout build
This is perfect for any 300 blackout build. I’ve shot subs and super Sonics rounds with this buffer installed and it all cycled perfectly. Definitely recommend this if building from scratch. Wouldn’t hurt to get a JP spring too
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Best buffer you can buy

by MikeG, Verified Owner from TX, United States Written on April 5, 2026
This thing is a game changer. Put it in my 10.5" AR .300 blackout and used a reduced Power Buffer Spring from Sprinco. That combination has not only DEFINITELY reduced felt recoil, but has improved reliability. I've put 500 rounds through it and I haven't had a single issue since. I originally was having some failure-to-feeds and light strikes due to the buffer and spring being a little heavy. Swapped out the H2 buffer with this Kynshot and that reduced Power spring and it's been absolutely perfect.
Pros:
  • Quality
  • reliability
  • effectiveness
Cons:
  • Little pricey
Best Used for:
  • SBR
  • Suppressed
Would recommend: Yes
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kinda works

by Sam, Verified Owner from TX, United States Written on March 14, 2026
Probobly better off using a a5 buffer tube and spring. Recoil dampening wasnt great just makes recoil feel diffrent.
Pros:
  • cool tech
Cons:
  • price
  • no real improvement vs cheaper systems
Best Used for:
  • Spending money
Would recommend: No
Was it helpful to you? Yes | No
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300 blk SBR

by Kkoz, Verified Owner from CO, United States Written on December 25, 2025
Excellent replacement for any stock buffer. Product is legit and made a noticeable difference right away shooting 220 grain subs in 8.5 barrel.
Pros:
  • None
Cons:
  • Abit more expensive, but worth the cost.
Would recommend: Yes
Was it helpful to you? Yes | No
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Smooth action!

by Josh O, Verified Owner from PA, United States Written on November 5, 2025
This seems to be a great addition to my build! Great quality!
Would recommend: Yes
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should be in every 300 blackout build!!

by Charles Spencer, Verified Owner from NC, United States Written on March 9, 2025
This was the last piece of my blackout puzzle, does everything it advertises! Makes getting back on target sooo much quicker. Will help ya shooting super’s and subs. Fixed my lockout problem when shooting subs, so i dont have to constantly adjust my gas bleed off.
Would recommend: Yes
3 of 3 found the following review helpful.
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noticeabl improvement

by marcesq, Verified Owner from TX, United States Written on March 8, 2025
Installed in a 300 blk piston 10.5” barrel. Worked great on 120, 150, 220 weight rounds (unsuppressed). Haven’t tried suppressed.
Would recommend: Yes
4 of 5 found the following review helpful.
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Buffer 300 blackout

by Justin, Verified Owner from PA, United States Written on March 1, 2025
Excellent product. Using it for my 300 blackout. I’m going to order another one soon.
Would recommend: Yes
3 of 3 found the following review helpful.
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300blackout buffer

by Gary A. Wilson, Verified Owner from FL, United States Written on April 25, 2024
I could not get my 300 blackout to cycle correctly I added kynshot and a light spring and now it cycles great! Great product.
Would recommend: Yes
5 of 5 found the following review helpful.
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Fixed cycling issue with my 300 BO

by Rick, Verified Owner from AZ, United States Written on March 3, 2024
Purchased this item and a Sprinco reduced power buffer spring for my 300 BO. Was having cycling issues with factory components on my full length AR with 150gr to 220 gr ammo from various manufacturers. Works well with the new setup and issue appears to have been fixed.
Would recommend: Yes
7 of 7 found the following review helpful.
Was it helpful to you? Yes | No
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Last updated 2025-11-12 UTC.