Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available
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Product description
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.
Features:
Specifications:
- 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
Includes:
- 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.
All 6 options on this page
- Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available - Buffer Weight: Carbine SKU ARM258-C · UPC 810048492435
- Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available - Buffer Weight: Heavy SKU ARM258-H · UPC 810048492442
- Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available - Buffer Weight: H2 SKU ARM258-H2 · UPC 810048492459
- Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available - Buffer Weight: H3 SKU ARM258-H3 · UPC 810048492466
- Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available - Buffer Weight: 9mm SKU ARM258-9 · UPC 810048492473
- Armaspec Sound Mitigation Buffer (SMB) Captured Gen 3 - Multiple Buffer Weights Available - Buffer Weight: AR-10 SKU ARM258-AR10 · UPC 810048492480
Customer reviews 28
Verified buyerRun to get rid of that spring sound you get when firing ARs, plus i I got it on sale and steal!
AT3 Tactical · We’re thrilled the SMB is giving you that butter-smooth action at a fraction of the cost, David, and we hope you have an absolute blast testing it out at the range with your new setup!
Installed on my PSA 16" AR-15, swapped out the carbine weight buffer with the H3. It shoots .223 55 grain Hornady ammo reliably and ejects casings at the 3 O'clock position.
Questions & Answers 15
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Which one of these buffer weights will work with ar15 .556 and a 14.5 barrel length
Chris Garnett · Apr 16, 2025AT3 Support Team — Thanks for reaching out I recommend H1 Thanks
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I'm acquiring parts for a 6.5 Grendel hunter build. I have the 18" light barrel with mid length port position and gas tube also . 875 gas block. A Grendel sight is having a combo velocity AR trigger- 3lb. Pull with a Gen3 SMB-H2 4.7oz. if you could, I need to know if this Gen.3 SMB is compatible with my upcoming build? Thank you in advance.
Joe Martinez · Jan 27, 2025AT3 Support Team — Yes, the Armaspec Gen3 Sound Mitigation Buffer (SMB-H2), which weighs 4.7 oz, is compatible with your upcoming 6.5 Grendel hunter build.
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I'd like to try one on a 5.56 with a 7.5" barrel, and a SB4 brace. Which one should I start with? And would that be the same one I'd also Use in a .300 BO, with the same setup? Thanks. Steve
Steve · Nov 6, 2024AT3 Support Team — For a 5.56 setup with a 7.5-inch barrel, starting with the H2 buffer (5.81 oz) is a good choice. This weight helps to mitigate recoil while ensuring reliable cycling, especially in shorter barrel configurations. If you plan to use the same setup for a .300 Blackout with the same 7.5-inch barrel, the H2 buffer would also be suitable in this case. The .300 BO typically operates well with H2 buffers, especially when using subsonic ammunition, which can help manage recoil effectively.
Warranty & returns
Backed by the Armaspec Lifetime Warranty!
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 rma@armaspec.com to request an RMA number.
Disclaimer: Manufacturer’s warranty is subject to change without prior notice.
90-day no-hassle returns
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.
