Expo Arms

Expo Arms ranks #38 of 437 brands on GunPartPicker so far in October 2026, just behind Holosun, with about 1 in every 167 parts builders added. Up from #58 in September. Builders are reaching for Expo Arms mostly for gas tube parts. The most added single part is the Expo Arms Mid-Length Gas Tube - Stainless Steel, taking the top spot from the Expo Arms® M-LOK Patrol Series AR-15 Handguard - Black - 15".

Handguards have not been restocked once this month. About 56% of the 142 Expo Arms products we track are in stock today.

Also popular this month: Expo Arms® M-LOK Patrol Series AR-15 Handguard - Black - 15", Expo Arms Standard AR-15 Charging Handle, Expo Arms Carbine Length Gas Tube - Stainless Steel and Expo Arms® M-LOK Patrol Series AR-15 Handguard - Black - 10.5".

Why Expo Arms

Expo Arms is a value AR parts line you can only buy at Primary Arms. Think small parts, buffer springs, gas tubes, handguards, uppers and bolt carriers, made in the USA and priced for first builds.

The warranty is the surprise. It's a limited lifetime warranty that covers defects, materials and workmanship, and it also covers normal wear and tear, which most parts makers leave out.

A buffer spring runs about $6 against roughly $20 for the typical one, and its handguards sit around $100 against roughly $175. Buffer springs and gas tubes each take about 3% of their slots, and handguards about 2%.

The trade-off is one store. If Primary Arms is out, you wait, and you can't price shop. We'd use Expo for springs, tubes and other wear parts where the warranty earns its keep.