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Expo Arms
Overview
The Expo Arms Mid-Length Gas Tube is designed specifically for mid-length gas systems, providing an optimal gas flow for reliable cycling in your AR-15. Made from polished stainless steel, this gas tube not only enhances the aesthetics of your build but also offers durability and resistance to corrosion. It is commonly found in builds featuring a mid-length gas system and chambered in 5.56 NATO, ensuring smooth operation and consistent performance.
Expo Arms Mid-Length Gas Tube - Stainless Steel ranks #12 of the 60 gas tubes builders have added on GunPartPicker so far in September 2026, behind the CMMG AR-15 Gas Tube Stainless Steel Mid-Length, with about 3% of all gas tubes added to builds. Up from #20 in August. Builds with this gas tube are nearly all chambered in 5.56 NATO, nearly all on mid-length gas, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today the one retailer we track has it in stock. Prices barely moved in August 2026, holding around $9.99, so there haven't been real sales lately. Buying today, the lowest price is $9.99 at Primary Arms, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 35 retailers
We ranked every gas tube by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Gas Tube Guide →Check it against the live catalog:
The part most often added in each category by the 22 builds that include this one
PSA AR-15 Built Stealth Upper Receiver - No T Marks - 516444539
PSA AR-15 "Stealth" Stripped Lower Receiver
FN AR-15 M16 Barrel 16 Mid-Length 5.56mm
CMMG AR15 Charging Handle Assembly, Black - 55BA5EC
KAK Industry Low Profile Gas Block .750 Steel Phosphate Finish Black
M16 Bolt Carrier Group 5.56X45mm NATO Full Chrome
Builds in the community that include the Expo Arms Mid-Length Gas Tube - Stainless Steel
| Build | Parts | Total |
|---|---|---|
 | 20 | $965.00 |
 | 9 | $1489.90 |
 | 11 | $562.51 |
 | 26 | $1619.09 |
 | 20 | $962.37 |
 | 24 | $1000.40 |
 | 21 | $664.13 |
2 global ratings
Top reviews
Picked this over a melonite tube because I wanted the stainless look. Polished finish matches well next to a stainless barrel. Pin holes lined up first try, took maybe 5 minutes to install with the gas block. Functionally its a gas tube, cant tell the difference once its running.
stainless tube was straight against a granite block. roll pin lined up first try with my pin punch. for the price its hard to beat, and stainless wont rust if you live somewhere humid
