Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 – Multiple Buffer Weights Available

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Improved & Easy-To-Install Captive Buffer Weights For AR Builds

The Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 is a quick and easy replacement for your standard buffer and spring. It is designed to keep the buffer spring from rubbing against the inner wall of the buffer tube providing smooth and consistent operation as well as providing less noise when firing the weapon.

The SMB also helps significantly in reducing the felt recoil which results in an excellent return to target acquisition, giving the shooter more accurate follow-up shots.

Multiple Buffer Weights

The Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 is available in different buffer weights such as Carbine, Heavy, H2, H3, 9MM, and AR-10. (Please choose in the dropdown above for the correct buffer weight).

Note For 9MM: For proper function of the SMB in your 9mm rifle or pistol, the extra weight on the back of the bolt carrier needs to be removed. It is held in with a spring/roll pin.


  • Single-stage captured drop-in replacement for your standard buffer and spring
  • Reduce felt recoil
  • Keep the buffer spring from rubbing against the inner wall of the buffer tube providing smooth and quiet operation
  • Adjustable spring weight  (*Main spring can be trimmed at .25 lbs per coil to reduce tension up to a max of 12 coils)
  • Made in the U.S.A.
  • Lifetime Warranty


  • Actual Weight (Complete System):
    • Carbine: 4.41 oz.
    • Heavy: 4.91 oz.
    • H2: 5.81 oz.
    • H3: 6.71 oz.
    • 9MM: 9.88 oz.
    • AR-10: 7.20 oz
  • Equivalent Weight:
    • Carbine: 3.3 oz.
    • Heavy: 3.8 oz.
    • H2: 4.7 oz.
    • H3: 5.6 oz.
    • 9MM: 6.9 oz.
    • AR-10: 4.7 oz


  • 1x Polymer Base Guide Rod
  • 1x Spring
  • 1x Buffer

Quick Instructions:

  • Insert polymer base with guide rod into the buffer tube.
  • Insert desired spring on the guide rod.
  • Insert the buffer over the spring.

Products available on this page:

Have Questions About this Product?

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

Armaspec Lifetime Warranty

  • All Armaspec products carry a LIFETIME WARRANTY and are warranted to be free from defects in material or workmanship.
  • Should there be a defect, we will repair or replace the product at our discretion at no cost to you.
  • Lifetime warranty does not apply to products sold as “blemished” or “manufacturer refurbished”.
  • You must have proof of purchase to initiate a WARRANTY claim.

Please email to to request an RMA number.

Disclaimer: Manufacturer’s warranty is subject to change without prior notice.

Customer Reviews

Based on 14 reviews
Cut the blowback by about half

Honestly thought it wouldn’t work but it does. Removed almost half the blow back on my 762 but this is the cheaper model. I believe the newer model will take away 3/4 of the blowback away

Thank you for taking the time to leave a review for our Armaspec Sound Mitigation Buffer. We're glad to hear that it has been able to reduce the blowback on your 762 by almost half. We appreciate your feedback and hope that our newer model will be able to further improve your shooting experience.

Smooth Cycle

I have it loaded on Aero lower built 556 with 11.5 upper. This help make the AR cycle better. No issues have shot over 700 rds

The only thing better then a gen3 is gen4!

Excellent product! Just as good as JP at literally half the cost! Thanks guys, I'm buying a third as I speak. It's the second from AT3, I don't understand how they are able to sell them cheaper then Armaspec directly but they absolutely are $13 cheaper!

Thank you for sharing your feedback! We're glad that you are satisfied with your purchase!

Timothy K
Stop shopping and buy it

Best decision I’ve made for my AR. Ran so smooth when I took it to the range. My 16 and 10.5 was flawless. Stop scrolling and buy it

Thanks for taking the time to share your feedback. We're glad we are satisfied with your purchase!

Steve Muth

Doesn’t hold my BCG locked. Slide lock catches, but then releases.

So sorry to hear about the issue, Steve. I already sent you an email to further help.