This is a left-handed AR-15 upper build kit chambered in 5.56 NATO, built around a 16.5-inch Satellite medium profile steel barrel with a QPQ nitride finish, a 1-7 twist rate, and a mid-length gas system. The left-handed Black Diamond Series slick side billet aluminum upper receiver anchors the front end with a left-hand ejection port and a clean slick side exterior profile that omits the forward assist from the receiver body. The mid-length stainless steel gas tube and micro low-profile steel gas block at .750 complete the gas system, and the Trinity Force ECHO 15-inch freefloat KeyMod handguard in black covers the forend. An A2 GI Birdcage flash hider at 1-2x28 closes out the muzzle end. BCG and charging handle are not included.
The left-handed Black Diamond Series slick side billet aluminum upper receiver anchors the front end with a left-hand ejection port and a clean slick side exterior profile that omits the forward assist from the receiver body. The 16.5-inch Satellite medium profile steel barrel brings a QPQ nitride finish and a 1-7 twist rate to the 5.56 NATO chamber, threaded at 1-2x28. The mid-length stainless steel gas tube and micro low-profile steel gas block at .750 run a mid-length gas system along the 16.5-inch barrel, a well-matched gas system length for this barrel profile and chambering. The Trinity Force ECHO 15-inch freefloat KeyMod handguard in black surrounds the barrel and gas system along the forend with KeyMod slots along the handguard body for accessory attachment across the full 15-inch length.
The A2 GI Birdcage flash hider threads onto the 1-2x28 muzzle end of the barrel. The included black steel crush washer seats at the barrel shoulder and completes the muzzle hardware for this kit.
Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. BCG and charging handle are not included.
Platform: AR-15
Caliber: 5.56x45mm NATO
Operating System: Direct Impingement
Barrel: 16.5-inch "Satellite" Medium Profile Barrel
Barrel Material: Steel
Barrel Finish: QPQ Nitride
Twist Rate: 1:8
Gas System: Mid-Length
Thread Pitch: 1/2x28
Gas Block Diameter: .750
Upper Receiver: Left-Handed Black Diamond Series Slick Side Billet Upper Receiver
Receiver Material: Billet Aluminum
Handguard: Trinity Force ECHO 15-inch Free Float Handguard
Handguard Attachment: KeyMod
Handguard Finish: Black
Gas Block: Micro Low-Profile Steel Gas Block, .750 Diameter
Gas Tube: Mid-Length Stainless Steel Gas Tube
Muzzle Device: A2 GI Birdcage Flash Hider
Crush Washer: Black Steel Crush Washer Included
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