Builder's Grade 11" 9mm Upper Receiver - Black | A2 | 9" M-LOK | Without Bolt Carrier Group and Charging Handle This 11 inch M-LOK upper receiver comes with a 9 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 11 Material 4150 Chrome Moly Vanadium Profile Straight Finish QPQ Corrosion Resistant Gas System Length Blowback Dimpled? No Twist Rate 1:10 Muzzle Thread 1/2x36 TPI Weight 17.6oz 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: 9" free float handguard MIL-STD 1913 Picatinny rail on top 2 M-Lok slots on 3 sides Precision Machined aircraft grade aluminum, for high strength and weight savings Hard Coat Anodized per Mil-A-8625F, Type III, Class 2 Clamp on system for easy assembly Steel Barrel nut to resist movement under heat 10 oz with barrel nut and hardware 1.35" Inside Diameter 1.63" Wide Made in USA 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: BGBU-119MM9A2-BLK UPC: