Armaspec SMB H3 Buffer Kit with Tube & Endplate – 5.6oz AR-15
Armaspec
$86.39
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Armaspec
Armaspec SMB H3 Buffer Kit with Tube & Endplate – 5.6oz AR-15
The Armaspec SMB H3 Buffer Kit delivers a complete, drop-in solution for AR-15 builders seeking reduced felt recoil and noticeably quieter cycling performance in a single, ready-to-install package.
- Includes SMB H3 buffer, buffer tube, endplate, and castle nut
- 5.6 oz H3 weight rating tames felt recoil on mid- and rifle-length builds
- Sound Mitigation Buffer design reduces the signature "ping" during cycling
- Mil-spec diameter tube fits all standard AR-15 lower receivers and stocks
- Eliminates the need to source individual components for your build
- Precision-machined construction ensures consistent function and long service life
Who This Is For
This kit is ideal for AR-15 builders and owners who want a complete buffer system upgrade in one package — whether you're completing a fresh lower build or replacing a worn OEM setup. It's especially well-suited for shooters running suppressed configurations, heavier bolt carriers, or .223 Wylde / 5.56 NATO rifles where the H3 weight helps smooth out the action and quiet the buffer spring noise that plagues standard mil-spec setups.
Specifications
| Brand | Armaspec |
|---|---|
| Model | SMB H3 Buffer Kit |
| Buffer Weight | 5.6 oz (H3) |
| Buffer Type | Sound Mitigation Buffer (SMB) |
| Kit Includes | SMB H3 Buffer, Buffer Tube, Endplate, Castle Nut |
| Compatibility | AR-15 Pattern Firearms |
| Tube Diameter | Mil-Spec |
| Material | Precision-Machined Aluminum / Steel |
Frequently Asked Questions
What makes the SMB H3 buffer different from a standard mil-spec buffer?
The Armaspec SMB (Sound Mitigation Buffer) is engineered to eliminate the audible "spring ping" that is common with standard mil-spec buffer springs and weights. The H3 designation refers to its 5.6 oz weight, which is heavier than a standard carbine buffer. This added mass slows bolt carrier velocity on the rearward stroke, reducing felt recoil and making the SMB H3 an excellent choice for mid-length gas systems, suppressed rifles, or any build where a softer, quieter action is desired.
Will this kit work with my existing AR-15 stock?
Yes. The buffer tube included in this kit is mil-spec diameter, which is compatible with the vast majority of AR-15 collapsible and fixed stocks on the market. If you are unsure whether your stock is mil-spec or commercial-spec, check the manufacturer's specifications — mil-spec stocks are the industry standard and are compatible with this tube.
Is the H3 weight appropriate for a standard 5.56 NATO / .223 Wylde carbine?
The H3 weight at 5.6 oz works best in carbine-length gas systems paired with heavier bolt carrier groups, or in mid- and rifle-length gas systems running standard BCGs. For a standard carbine-length rifle with a light BCG, the heavier buffer may cause short-stroking with some ammunition. It is particularly well-suited for suppressed AR-15 builds where increased back-pressure can cause over-cycling — the additional mass helps normalize bolt carrier velocity in those conditions.
