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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.
Prices checked
Expo Arms Mid-Length Gas Tube - Stainless Steel was the fourth most added gas tube on GunPartPicker in October 2026, behind the Strike Industries AR-15 Gas Tube - Carbine Length, with about 9% of all gas tubes added to builds. Up from #12 in September. Builds with this gas tube are mostly chambered in 5.56 NATO (88%), mostly on mid-length gas (94%), and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today the one retailer we track has it in stock. Prices barely moved in October 2026, holding around $9.99, with no real sale all month. Buying today, the lowest price is $9.99 at Primary Arms, which matches the best price we saw in October.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 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 builds that include this one
FN AR-15 M16 Barrel 16 Mid-Length 5.56mm
KAK Industry Low Profile Gas Block .750 Steel Phosphate Finish Black
PSA AR-15 "Stealth" Stripped Lower Receiver
KAK Industry Bolt Carrier Group For AR-15 8620 Steel Construction Chrome Lined Phosphate Finish Black C158 Bolt
Expo Arms® M-LOK Patrol Series AR-15 Handguard - Black - 15"
Expo Arms Standard AR-15 Charging Handle
Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Expo Arms Mid-Length Gas Tube - Stainless Steel
| Build | Parts | Total |
|---|---|---|
 | 20 | $981.81 |
 | 9 | $1489.90 |
 | 11 | $563.49 |
 | 26 | $1696.64 |
 | 20 | $981.89 |
 | 24 | $1068.64 |
 | 21 | $658.17 |
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
