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ar_Tommy2Toes
First 300 blackout build

First 300 blackout AR-15 Build

With the Geissele Super Duty Mod 1 .300 upper receiver, Wilson Combat .300 Blackout 8" barrel and FAXON Chameleon 5.56 Nitride bolt carrier group.

Updated

12 of 12 core parts · complete

For night work went with the Wilson Combat barrel

Shop the parts$4057.51(8/9 priced)

300 Blackout Specs

Platform
AR-15
Caliber
300 Blackout
Overall Length
8"
Lower
KAC

How this build compares to other 300 Blackout builds

From parts picked in GunPartPicker builds · November 2026

The Wilson Combat .300 Blackout 8" is the #3 barrel in 300 Blackout builds on GunPartPicker, picked in 7% of them.

Start from this build, swap any part and compare live prices.

See popular 300 Blackout builds

300 Blackout Parts List(9 parts)

Est. Total
$4057.51
Lower Receiver
Knights Armament Company SR-30 IWS Complete Lower Receiver .300 BLK
Platform: AR-15
Caliber: 300 Blackout
Assembly: Complete
Color: Black
Buy at Brownells
Upper Receiver
Geissele Automatics Super Duty Mod 1 .300 Blackout AR-15 Complete Upper Receiver - 8" - DDC
Color: FDE
Caliber: 300 Blackout
Barrel Length: 8
Assembly: Complete
Platform: AR-15
Barrel
Wilson Combat .300 Blackout 8" Match Grade 6 Groove Barrel, Matte Bead Blasted Stainless - TR-300SBRPG8RT7
Barrel Length: 30
Barrel Profile: M4
Caliber: 300 Blackout
Gas Block Diameter: .750
Thread Pitch: 5/8x24
Twist Rate: 1:7
Gas System Length: Pistol
Finish: Stainless
Charging Handle
Radian Weapons Ar-15 Raptor/talon L/s Combo Black Anodized
Finish: Hardcoat Anodized
Latch Style: Extended
Color: Black
Hand: Ambidextrous
Material: 7075-T6 Aluminum
Platform: AR-15
Bolt Carrier Group
Foregrip
Tango Down Short Quick Disconnect Vertical Grip - Black
Storage: No
Color: Black
Grip Type: Vertical
Grip Style: Vertical
Mounting Interface: Picatinny
Optic
EOTech XPS2 Holographic Sight, Tan - XPS2-0TAN
Optic Type: Holographic
Dot Size: 1 MOA
Mounting Interface: Picatinny
Reticle Color: Red
Estimated Build Total(8 of 9 parts priced)
$4057.51

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