Davidson Defense Stardust 300 w/Magpul BTR Brace 8.5-inch Pistol-Gas 1:8 .300 BLK AR-15 Freefloat Quad-Rail Handguard Pistol Full Build Kit

Davidson Defense Stardust 300 8.5-inch Pistol-Gas 1-in-8 .300 Blackout AR-15 Freefloat Quad-Rail Full Build Kit with Magpul BTR Brace

The Stardust 300 Full Build Kit from Davidson Defense is a .300 Blackout AR-15 pistol configuration built around an 8.5-inch heavy-profile barrel with a pistol-length gas system. The kit includes the upper assembly, a bolt carrier group, charging handle, Magpul BTR pistol brace, lower parts kit, and buffer system components. The lower receiver is not included.

Key Features

• .300 Blackout chambering with 8.5-inch heavy-profile pistol-gas barrel
• 4150 Chrome Moly Vanadium barrel with Parkerized finish and 1-in-8 twist rate
• 5-in-8x24 thread pitch with muzzle-mounted fake can
• Panhead billet upper receiver with .458 ejection port door, 6061-T6 aluminum with anodized finish
• Black 6061-T6 aluminum 10-inch freefloat quad-rail handguard
• Micro low-profile gas block, .750 O.D., barrel steel
• 9310 alloy steel bolt carrier group with nitride finish
• Mil-Spec M4 charging handle
• Magpul BTR pistol brace, black
• Mil-Spec heavy-duty 6-position buffer tube with 3 oz buffer
• Standard AR-15 carbine recoil spring, receiver end plate, and castle nut included
• Lower parts kit included

Perfect For

• .300 Blackout AR-15 pistol builds
• Compact 8.5-inch barrel configurations in .300 Blackout
• Builders completing a stripped lower receiver
• Quad-rail handguard builds with full-length rail surface
• Pistol configurations with an adjustable stabilizing brace

Panhead Barrel and Upper Receiver

The barrel runs 8.5 inches in .300 Blackout with a 1-in-8 twist rate, heavy profile, and 4150 Chrome Moly Vanadium construction with a Parkerized finish. The pistol-length gas system pairs with a .750 O.D. micro low-profile barrel steel gas block. The Panhead billet upper receiver features a .458 ejection port door and is 6061-T6 aluminum with an anodized finish. Thread pitch is 5-in-8x24, and the kit includes a muzzle-mounted fake can.

Handguard

The 10-inch freefloat quad-rail handguard is 6061-T6 aluminum with a black finish. The quad-rail profile provides full-length rail surface on all four sides for accessory placement across the entire forend. At 10 inches, the handguard length exceeds the 8.5-inch barrel, so the barrel does not protrude past the handguard, with the muzzle device providing clearance forward of the handguard end.

Bolt Carrier Group and Charging Handle

The included bolt carrier group covers the 5.56, .223, .300, and .350 platform family and is 9310 alloy steel with a nitride finish. A Mil-Spec M4 charging handle completes the upper component set.

Magpul BTR Pistol Brace

The kit includes the Magpul BTR pistol brace in black. The BTR brace pairs with the included Mil-Spec heavy-duty 6-position buffer tube and provides the rear interface for this pistol configuration.

Buffer System and Lower Components

The kit includes a Mil-Spec heavy-duty 6-position buffer tube, a 3 oz buffer, a standard AR-15 carbine recoil spring, a receiver end plate, and a castle nut. A lower parts kit covers the internal lower receiver components required for lower completion. These components cover the full lower completion hardware outside the serialized receiver itself.

Follow safe handling and manufacturer instructions. Ensure compliance with all applicable federal, state, and local laws. Lower receiver not included.