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Expo Arms
Overview
The Expo Arms AR-15 Rifle Buffer weighs 5.4 ounces and is specifically designed for use in AR-15 platforms. This buffer type is critical for ensuring the proper cycling of the action, especially in builds with a mid-length gas system, as it helps to manage the recoil impulse and enhances overall reliability. Commonly found in 5.56 NATO caliber setups, this buffer is a solid choice for builders looking to optimize their rifle's performance.
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Builders have added the Expo Arms AR-15 Rifle Buffer - 5.4 Oz to their builds on GunPartPicker. Since April 2026, it ranks #132 of the 209 buffers builders have added. Builds with this buffer are mostly chambered in 5.56 NATO (82%, then .223 Wylde 14%), split between mid-length (42%) and carbine-length (26%) gas systems, and nearly all AR-15.
Updated · from real builds on GunPartPicker
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 Ar-15 Rifle Buffer - 5.4 Oz
| Build | Parts | Total |
|---|---|---|
 | 27 | $2283.99 |
 | 24 | $963.97 |
 | 16 | $606.78 |
 | 25 | $541.70 |
 | 24 | $2726.93 |
1 global rating
Top reviews
Running this 5.4oz rifle buffer in a 20-inch 5.56 build with a mid-length gas system. It's doing its job reliably, cycling is smooth and consistent. Recoil impulse feels well managed. My only small gripe is it came with a couple tiny cosmetic dings on the finish, nothing major but noticeable if you're particular. Still a solid performer for the price.