The Ronin Competition Left-Handed 8.5-inch Pistol-Gas Upper Build Kit is tailored for AR-15 platforms chambered in .300 BLK. Featuring an 8.5-inch heavy barrel made from 4150 Chrome Moly Vanadium with a parkerized finish, it offers durability and performance. The barrel has a 1:8 twist rate and a pistol-length gas system, utilizing a micro low-profile gas block with a .750 O.D. Additionally, it includes a 5/8x24 TPI muzzle device—an AR-15/AR-10 GI Birdcage flash hider optimized for .300 Blackout applications.
The kit is paired with a left-handed Black Diamond Series slick-slide billet upper receiver crafted from 6061-T6 aluminum, anodized for longevity. Completing the build is the ACE-20 Series 7" M-Lok freefloat handguard, constructed from aircraft-grade aluminum, allowing for modular accessory attachment while maintaining a streamlined profile. This kit is ideal for gunsmiths seeking a reliable left-handed solution for their next build.
Caliber: .300 Blackout
Barrel: 8.5" .300 Blackout AR-15 Heavy Barrel, Pistol Gas, 1:8T, 5/8x24
Barrel Length: 8.5 inches
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Finish: Parkerized
Barrel Profile: Heavy
Barrel Twist Rate: 1:9
Barrel Thread Pitch: 5/8x24
Barrel Gas System Length: Pistol
Gas Block: Micro Low-Profile Gas Block, .750 O.D Barrel Steel
Gas Block Size: 0.75
Gas System: Direct Impingement
Muzzle Device: AR-15 TPI GI Birdcage Flash Hider for .308 7.62x39 .300 Blackout
Muzzle Thread Pitch: 5/8x24
Upper Receiver: Left-Handed Black Diamond Series AR-15 Slick Slide Billet Upper
Upper Receiver Material: 6061-T6 Aluminum
Upper Receiver Finish: Anodized
Handguard Name: ACE-20 Series 7" M-LOK Freefloat Handguard
Handguard Material: Aircraft-Grade Aluminum
Handguard Color: Black
Handguard Style: M-LOK Free-Float
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