The Ronin Competition Left-Handed 8.5-inch .300 BLK AR-15 Complete Upper Build is engineered for performance and versatility in tactical scenarios. Featuring an 8.5-inch heavy barrel with a 1:8 twist rate and a pistol gas system, this upper ensures reliable cycling while maintaining compact size. The barrel, made from 4150 Chrome Moly Vanadium, has a phosphate finish, and is threaded 5/8x24 for compatibility with various muzzle devices, including the included GI Birdcage Flash Hider.
The M-Lok Freefloat handguard, crafted from lightweight 6061-T6 aluminum, provides ample accessory mounting options, and the left-handed Billet Upper Receiver enhances the ergonomic experience. A low-profile gas block and a durable, nitride-finished Davidson Defense Premium Bolt Carrier Group complete this assembly, making it ideal for left-handed shooters who value efficiency in a compact format. This upper build is a solid choice for any gunsmith seeking performance without compromise.
Caliber: .300 Blackout
Barrel Length: 8.5 inches
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Thread Pitch: 5/8x24
Barrel Gas System Length: Pistol
Barrel Profile: Heavy
Barrel Twist Rate: 1:9
Barrel Finish: Phosphate
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: M-Lok Freefloat
Handguard Length: 7 inches
Upper Receiver: Left-Handed Black Diamond Series AR-15 Slick Slide Billet Upper
Upper Receiver Material: 6061-T6 Aluminum
Upper Receiver Finish: Anodized
Gas Block: Micro Low-Profile Gas Block, .750 O.D Barrel Steel
Gas Block Size: 0.75
Muzzle Device Details: AR-15 TPI GI Birdcage Flash Hider
Muzzle Thread Pitch: 5/8x24
Charging Handle: United Defense AR-15 "Holy" Ambidextrous Charging Handle
Bolt Carrier: Davidson Defense Premium Left Handed Bolt Carrier Group BCG M16 AR-15
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
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