Rainier Arms RUC PRO MK1 5.56 NATO Partial Upper Receiver

Introducing the RUC PRO MK1 Partial Upper. 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!

10.5" Upper:

• 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

11.5" Upper:

• Rainier Arms Select 5.56 NATO Barrel - 12.5"
• Rainier Arms Forged Upper Receiver
• Rainier Industries PRO Series MK1 Handguard - 11.7"
• Rainier Arms Low Pro Gas Block - .750" (Non-adjustable)
• Rainier Industries .223/5.56 Flash Hider - 1/2x28
• Weight: 3 lbs 2.6 oz

12.5" Upper:

• Rainier Arms Select 5.56 NATO Barrel - 12.5"
• Rainier Arms Forged Upper Receiver
• Rainier Industries PRO Series MK1 Handguard - 11.7"
• Rainier Arms Low Pro Gas Block - .750" (Non-adjustable)
• Rainier Industries .223/5.56 Flash Hider - 1/2x28
• Weight: 3 lbs 2.6 oz

14.5" Upper:

• Rainier Arms Select 5.56 NATO Barrel - 14.5"
• Rainier Arms Forged Upper Receiver
• Rainier Industries PRO Series MK1 Handguard - 13.7"
• Rainier Arms Low Pro Gas Block - .750" (Non-adjustable)
• Rainier Industries .223/5.56 Flash Hider - 1/2x28
• Weight: 3 lbs 8.4 oz

16" Upper:

• Rainier Arms Select 5.56 NATO Barrel - 16"
• Rainier Arms Forged Upper Receiver
• Rainier Industries PRO Series MK1 Handguard - 15"
• Rainier Arms Low Pro Gas Block - .750" (Non-adjustable)
• Rainier Industries .223/5.56 Flash Hider - 1/2x28
• Weight: 3 lbs 12.6 oz

Please NOTE: BCG and Charging Handle NOT Included.