The Big Brother 20-inch AR-15 5.56 NATO Rifle Full Build Kit from Davidson Defense is engineered for durability, reliability, and accuracy. This kit features a 20-inch barrel made from 4150 Chrome Moly Vanadium, with a heavy H-Bar profile and a 1:7 twist rate. The phosphate finish ensures long-lasting performance, while the rifle-length gas system enhances reliability. The handguard is 15 inches long, constructed from 6061-T6 aluminum, and features an M-Lok design for versatile accessory attachment. The AR-15 Mil-Spec charging handle adds to the performance of this build. The bolt carrier is made from 9310 alloy steel with a nitride finish, providing exceptional strength. This rifle is equipped with a GI Birdcage flash hider for effective muzzle control. Additionally, the adjustable carbine stock allows for customizable length of pull, catering to individual shooter preferences. This full build kit allows gunsmiths to assemble a reliable 5.56 NATO rifle tailored to their needs.
Caliber: 5.56x45mm NATO
Barrel Length: 20-inches
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Twist Rate: 1:7
Barrel Profile: Heavy (H-Bar)
Barrel Finish: Phosphate
Gas System Length: Rifle
Barrel Thread Pitch: 1/2x28
Gas Block Size: 0.75
Handguard Length: 15-inch
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: M-Lok
Charging Handle: AR-15 Mil-Spec
Bolt Carrier Material: 9310 Alloy Steel
Bolt Carrier Finish: Nitride
Muzzle Device: GI Birdcage Flash Hider
Muzzle Device Finish: Manganese Phosphate
Muzzle Thread Pitch: 1/2x28
Rifle Stock: Adjustable Carbine Stock
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