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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.
Builders have been adding the Expo Arms AR-15 Rifle Buffer - 5.4 Oz to their builds on GunPartPicker since January 2026. All time, it ranks #116 of the 176 buffers builders have added. Builds with this buffer are mostly chambered in 5.56 NATO (70%, then .223 Wylde 20%), split between mid-length (40%) and rifle-length (30%) gas systems, and mostly AR-15 (82%, then AR-10 9%).
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 $19.95 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 Ar-15 Rifle Buffer - 5.4 Oz
| Build | Parts | Total |
|---|---|---|
 | 27 | $2165.69 |
 | 24 | $949.70 |
 | 16 | $658.67 |
 | 25 | $840.78 |
 | 24 | $2667.71 |
2 global ratings
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.
Expos rifle length buffer at 5.4 oz is the right weight for an A2 stock setup running a 20 inch barrel. Inside weights dont rattle. Body is matte phosphate steel which wont show wear like aluminum. Fits any rifle length buffer tube cleanly.
