“FN 20-100042 AR-15 5.56x45mm NATO 18″ Button Rifled M16 Profile Rifle Length Gas System, Black Phosphate Cold Hammer Forged Chrome Lined” has been added to your cart. View cart

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March 24, 2026ROSCO K9 SAGE DYN BBL 12.5″ 5.56 1/7
$184.50
ROSCO K9 SAGE DYN BBL 12.5″ 5.56 1/7
12 in stock
SKU: RSR|ROSK9-125HYSAGE5567PT
Category: AR Barrels
The K9 12.5 features a proprietary patrol-length gas system that is smoother than a carbine length and more reliable than a mid-length. Because this is the optimal amount of gas, the barrel performs reliably whether suppressed or unsuppressed. The K9’s continuous taper profile is a proven design from the past, ideal for dissipating heat during hard use. It also includes an updated target crown carried over from the Purebred series. This crown has no 90-degree cuts, which improves harmonics, fit, and finish. NOTE: COMES WITH PATROL LENGTH GAS TUBE.
| UPC | 850039693069 |
|---|---|
| Manufacturer | ROSCO MANUFACTURING |
| Manufacturer Part Number | K9-125-HY-SAGE-556-7-PT |
| Barrel Length | 12.5" |
| Caliber/Gauge | .223 REM/5.56 NATO |
| Length | 12.50" |
| Model | K9 |
| Rate of Twist | 1:7" |





