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Expo Arms
Overview
The Expo Arms H2 AR-15 Carbine Buffer is designed specifically for carbine-length gas systems, providing the necessary weight to ensure reliable cycling and performance in your build. Its design helps to absorb recoil and reduce wear on your rifle's components, making it an essential part of a well-functioning AR-15 setup. This buffer commonly appears in builds featuring a mid-length gas system and chambered in 5.56 NATO, optimizing performance for those configurations.
Expo Arms H2 AR-15 Carbine Buffer With Flat Dark Earth Bumper ranked #48 of the 88 buffers builders added on GunPartPicker in August 2026. Builders have been adding it to their builds on GunPartPicker since January 2026. All time, it ranks #41 of the 177 buffers builders have added. Builds with this buffer are nearly all chambered in 5.56 NATO, split between mid-length (57%) and carbine-length (29%) gas systems, and mostly AR-15 (80%, then AR-10 20%).
It was out of stock everywhere we track for all of August 2026, and today the one retailer we track is out of stock. Listed prices start at $24.95 at Primary Arms for when it comes back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every buffer by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Buffer Guide →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Expo Arms H2 Ar-15 Carbine Buffer With Flat Dark Earth Bumper
| Build | Parts | Total |
|---|---|---|
 | 35 | $3423.03 |
 | 21 | $1898.36 |
 | 32 | $2641.72 |
 | 30 | $2820.74 |
 | 28 | $4773.42 |
 | 29 | $2150.66 |
 | 22 | $1398.51 |
1 global rating
Top reviews
Expos H2 carbine buffer with the FDE bumper is a nice cosmetic touch when you can see the bumper through a clear stock. Weight is 4.6 oz as expected for an H2. Inside weights dont rattle. Fits any milspec carbine receiver extension.
