Right To Bear Complete 5.5" 9mm Upper Receiver - Black | FLASH CAN | 7" M-LOK | With Bolt Carrier Group and Charging Handle This Complete 5.5 inch M-LOK upper receiver comes with a 7 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 5.5" Material 4150 Chrome Moly Vanadium Profile Straight Finish QPQ Corrosion Resistant Gas System Length Blowback Gas Block Journal .N/A Dimpled? No Twist Rate 1:10 Muzzle Thread 1/2x36 TPI Weight 9.6oz 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***Please allow an additional 2-3 business days of lead time as these uppers are made to order.*** SKU: RTB559MM7FC-BLK UPC: