Rainier Arms Ruc Pro Mk1 5.56 NATO Partial Upper Receiver Black 16 in RA-MK1-16-PU-BLK

Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 16 in RA-MK1-16-PU-BLK. Bringing the highest quality parts to the market while offering the best value as well. This partial upper utilizes a Rainier Arms Low Pro nonadjustable gas block on our new and improved Rainier Arms Select barrel. Pairing up with new PRO series MK1 handguard to provide shooters with a rock solid handguard that can take any abuse. Throw in your favorite charging handle and bolt carrier group and you are good to go Specifications for Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver: Manufacturer: Rainier Arms Caliber: 5.56x45mm NATO Barrel Profile: Medium Barrel Twist Rate: 1-8 Firearms Threads Per Inch: 1/2x28 Finish: Nitride Color: Black Gun Model: AR-15 Fabric/Material: 416R Stainless Steel Nitrided Gas Block Journal Size-Diameter: .750 in Handguard Style: M-LOK w/ Top Picatinny Rail System Gun Make: AR Platform Bolt Carrier Group Included: No Charging Handle Included: No Magazine Included: No Condition: New Features of Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Rainier Arms Select 5.56 NATO Barrel - 10.5" Rainier Arms Forged Upper Receiver Rainier Industries PRO Series MK1 Handguard - 9.55" Rainier Arms Low Pro Gas Block - .750" (Non-adjustable) Rainier Industries .223/5.56 Flash Hider - 1/2x28 Carbine Gas Length Weight: 2 lbs 14 oz Package Contents: Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver What firearm models does the manufacturer say Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver is compatible with? The manufacturer suggests that Rainier Arms Ruc Pro Mk1 5.56 Nato Partial Upper Receiver is compatible with AR-15Rainier Arms RA-MK1-16-PU-BLK: Ruc Pro Mk1 5.56 Nato Partial Upper Receiver Black 16 in