RTB Complete 4.5" 9mm Upper Receiver - Black FLASH CAN 4.25" M-LOK With BCG & CH - $200.79 after code "BUILDUP20"

Description

This Complete 4.5 inch M-LOK upper receiver comes with a 4.25 inch free float handguard and is built with only the best Mil-Spec components. The heart of this upper is comprised of a 4150 barrel and our black nitride bolt carrier group that is finished with an incredible polish, making the action smooth and easy to keep clean.

Barrel
Specifications
Caliber 9mm
Length 4.5
Material 4150 Chrome Moly Vanadium
Profile Straight
Finish QPQ Corrosion Resistant
Gas System Length None
Gas Block Journal N/A
Dimpled? No
Twist Rate 1:10
Muzzle Thread 1/2x36 TPI
Weight 8.3oz
Barrel Extension Integrated
Target Crown 11 Degree

Bolt Carrier Group:

Colt & Glock Compatible
USA made 8620 Steel Carrier Construction
Phosphated or Nitrided Finish
Heavy Firing Pin Retaining Spring
13.7 oz.

Upper Receiver:

This .22LR / 9mm upper receiver assembly is made from forged 7075-T6 aluminum and is Hard Coat Anodized. It meets military specifications and comes in a true slick side configuration. The ejection port door is sized for 9mm and 22LR. This upper does not have a shell deflector, nor does it have a forward assist.

Machined from a Mil-Spec 7075 T6 forging
Type III Hardcoat Anodized finish

Handguard:

MATERIAL: HARD COAT ANODIZED/CERAKOTED ALUMINUM HANDGUARD, ALUMINUM BARREL NUT
PRECISION BORE
ACCEPTS M-LOK RAIL SECTIONS & ACCESSORIES
7075-T6 BARREL NUT
RAIL LENGTH IS MEASURED ALONG THE TOP
INNER DIAMETER: 1.36"

Charging Handle:

Alloy Charging Handle Assembly
Complete with Standard Latch
Made from hardcoat anodized aluminum
Black finish

Please Note: Uppers may present light fouling from our quality control process and/or test firing

SKU: RTB459MM425FC-BLK