Description
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.
Specifications
Caliber: .300 Blackout
Barrel Name: 8.5" .300 Blackout AR-15 Heavy Barrel
Barrel Length: 8.5 inches
Barrel Material: 4150 Chrome Moly Vanadium
Barrel Finish: Parkerized
Barrel Profile: Heavy
Barrel Twist Rate: 1:8
Barrel Thread Pitch: 5/8x24
Barrel Gas System Length: Pistol
Gas Block Size: 0.750 inches
Gas Block Name: Micro Low-Profile Gas Block, .750 O.D Barrel Steel
Muzzle Device: Muzzle Mounted Fake Can, 5/8x24, .308
Muzzle Thread Pitch: 5/8x24
Upper Receiver Name: Panhead Billet Upper Receiver (NOFA) .458 Ejection Port Door
Upper Receiver Material: 6061-T6 Aluminum
Upper Receiver Finish: Anodized
Handguard Material: 6061-T6 Aluminum
Handguard Color: Black
Handguard Style: 10-inch Freefloat Quad Rail
Charging Handle: AR-15 M4 Charging Handle Mil-Spec Quality
Bolt Carrier Group Material: 9310 Alloy Steel
Bolt Carrier Group Finish: Nitride
Bolt Carrier Name: AR-15 5.56/.223/.300/.350 Complete Bolt Carrier Group
Pistol Brace Information: Magpul BTR Pistol Brace, Black, AR-15, for Standard Mil-Spec Buffer Tube
Buffer Tube Kit: Mil-Spec Heavy-Duty AR-15 6-Position Buffer Tube
Buffer Weight: 3 oz
Part Number: PI-PK-300-64267-BTR
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