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Expo Arms
Overview
The Expo Arms Mil-Spec 6-Position Buffer Tube is designed specifically for carbine builds, utilizing a durable 7075-T6 aluminum construction that ensures strength while keeping weight manageable. This tube supports a Mil-Spec design, allowing for a wide range of stock options and providing adjustability for length of pull, which is crucial for optimizing ergonomics and comfort during use. You will typically find this buffer tube in carbine gas system builds chambered in 5.56 NATO, making it a versatile choice for standard AR-15 configurations.
Based on build data

Strike Industries Extended Bolt Catch
Bolt Catch
Law Tactical AR Folding Stock Adapter Gen 3 - HK
Stock Adapter
Expo Arms Ar-15 Carbine Buffer Spring - 17-7 Steel
Buffer Spring
Strike Industries Cobra Billet Aluminum Trigger Guard - Red
Trigger Guard
Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK
Takedown Pin
Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C
Buffer SpringAggregated and anonymized data showing how builders use this product
| Product | Category | Times Built Together |
|---|---|---|
| Strike Industries Extended Bolt Catch | Bolt Catch | 82 |
| Law Tactical AR Folding Stock Adapter Gen 3 - HK | Stock Adapter | 73 |
| Expo Arms Ar-15 Carbine Buffer Spring - 17-7 Steel | Buffer Spring | 67 |
| Strike Industries Cobra Billet Aluminum Trigger Guard - Red | Trigger Guard | 60 |
| Strike Industries AR-10 Shift Pins, Black - SI-AR10-SHIFT-BK | Takedown Pin | 59 |
| Strike Industries Flat Wire Spring for AR Carbine - AR-FWS-C | Buffer Spring | 57 |
| Platform | Percentage |
|---|---|
| AR-15 | 79.5% |
| AR-10 | 18.2% |
| AR-9 | 2.4% |
| Caliber | Percentage |
|---|---|
| 5.56 NATO | 67.3% |
| .223 Wylde | 11.5% |
| 300 Blackout | 7.8% |
| .308 Win | 4.7% |
| .450 Bushmaster | 2.2% |
| 6mm ARC | 1.9% |
| 9mm | 1.2% |
| 6.5 Grendel | 1.2% |
| .458 SOCOM | 0.6% |
| 7.62x39mm | 0.6% |
| .22 ARC | 0.3% |
| .22 LR | 0.3% |
| .224 Valkyrie | 0.3% |
| Gas System | Percentage |
|---|---|
| Mid-Length | 45.3% |
| Carbine | 27% |
| Rifle | 17.2% |
| Pistol | 9.9% |
| Blowback | 0.4% |
| Intermediate | 0.4% |
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