“FN 20-100041 AR-15 5.56x45mm NATO 16″ Button Rifled M16 Profile Mid Length Gas System, Black Phosphate Cold Hammer Forged Chrome Lined” has been added to your cart. View cart

Leapers MTU056 Black Aluminum Compatible w/ MP5/MP5K Pattern
April 16, 2026
Patriot Ordnance Factory Minuteman Complete Upper 5.56x45mm NATO 10.50″ Black Nitride Barrel Aluminum Black Anodized Receiver 9″ M-LOK Handguard Lo Pro DI Gas Block (Mid Length)
April 16, 2026Proof Research 128688 AR-Style Barrel 6mm ARC 18″ Stainless Steel Finish & Material Rifle Length with Threading & .750″ Gas Journal Diameter for AR-Platform
$649.00
Proof Research 128688 AR-Style Barrel 6mm ARC 18″ Stainless Steel Finish & Material Rifle Length with Threading & .750″ Gas Journal Diameter for AR-Platform
7 in stock
SKU: LIP|PR128688
Category: AR Barrels
Proof Research’s barrels exemplifies relentless pursuit of excellence. Whatever your preference is, you can expect the finest rifle barrel in the industry. The Traditional Steel barrel is long-lasting and extreme pressure resistant.
| UPC | 843068128688 |
|---|---|
| Manufacturer | Proof Research |
| Manufacturer Part Number | 128688 |
| Barrel Length | 18" |
| Caliber/Gauge | 6MM ARC |
| Length | 18" |
| Model | AR-Style Barrel |
| Product Type | Accessory-Barrels |
| Rate of Twist | 1-in-7.5 |
| Shipping Weight | 0.0 |





