The Rainier Arms / Rellim Arms Take Down upper receiver assembly combo let's you switch between a 8.5" .223 Wylde configuration into a 8" 300BLK configurations in a matter of seconds.

Build Specs:

• Rellim Arms Proprietary Receiver/QD Barrel Nut
• Rainier Arms Upper Receiver
• Rainier Arms Urban Combat Rail - 7"
• Rainier Arms AR-15 Precision Match Grade BCG - Nitride
• Rainier Arms Match .223 Wylde Barrel - 8.5" / Rainier Arms Select 300BLK Barrel - 8"
• Rainier Arms Proprietary Avalanche Charging Handle
• Superlative Adjustable Gas Block
• A2 Flash Hider
• Weight: 3lbs 4.2 oz