This Barreled 4.5 inch M-LOK upper receiver comes with a 5.5 inch free-float handguard and is built with only the best Mil-Spec components. The heart of this upper is comprised of a 4150 M4 barrel.

Barrel:
Barrel Material: 4150 CMV Steel
Barrel Type: Button Rifled
Barrel Caliber: 9MM SAAMI (9x19mm Parabellum)
Barrel Twist: 1:10
Barrel Length: 4.5”
Barrel Profile: Light (.740" at the thinnest cross-section)
Inside Finish: Black QPQ Salt Bath Nitride
Outside Finish: Black QPQ Salt Bath Nitride
Muzzle Thread: 1/2x36" TPI (Threads Per Inch)
Barrel Extension: AR15 (Will work with any Milspec AR15 Upper Receiver)
Weight: 9.5oz
Integrated feed ramp
Designed to work with both Colt and Glock style AR-9 builds
11-degree Target Crown

Upper Receiver:

Machined from a Mil-Spec 7075 T6 Forging
Black Anodization

Handguard:

5.5" free-float handguard
MIL-STD 1913 Picatinny rail on top
2 M-Lok slots on 3 sides
Precision Machined 6000 Series aluminum, for high strength and weight savings
Clamp-on system for easy assembly
Steel Barrel nut to resist movement under heat
Made in the USA

SKU: RTB459MM55
UPC: 860006521875

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