TacFire

TACFIRE BU-300-8 8 300BO BUILT UPPER W/BCG

All TacFire upper receivers
TACFIRE BU-300-8 8 300BO BUILT UPPER W/BCG - Upper Receiver for AR-15 - view 1
TACFIRE BU-300-8 8 300BO BUILT UPPER W/BCG - Upper Receiver for AR-15 - view 2
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TacFire

Overview

The TACFIRE BU-300-8 is a complete upper receiver designed specifically for the AR-15 platform and chambered in 300 Blackout. This upper includes a bolt carrier group (BCG), making it ready to mount directly onto your lower receiver for a streamlined build process. Commonly found in tactical and hunting configurations, this upper is ideal for builders looking to leverage the versatility of the 300 Blackout cartridge.

Specifications

MPNBU3008
AssemblyComplete
Caliber300 Blackout
PlatformAR-15

Available Merchants(4)

Prices checked

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Optics Planet logo
Optics Planet
Free shipping
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In Stock
$269
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Classic Firearms logo
Classic Firearms
Shipping varies
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In Stock
$290
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KY Gun Company logo
KY Gun Company
Flat rate shipping
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In Stock
$297
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BattleHawk Armory logo
BattleHawk Armory
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Out of Stock
$244
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Build history on GunPartPicker

Builders have been adding the TACFIRE BU-300-8 8 300BO BUILT UPPER W/BCG to their builds on GunPartPicker since April 2026. All time, it ranks #241 of the 1,683 upper receivers builders have added.

Availability is good: it was in stock at one retailer or another nearly every day in September 2026, and today 3 of the 4 retailers we track have it in stock. It dipped to $241.33 at BattleHawk Armory for a stretch in September 2026, well under its usual $289.99, so sales do come around. Buying today, the lowest price is $269.49 at Optics Planet, above September's low of $241.33, so a better deal may come back.

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Frequently Built With

The part most often added in each category by the builds that include this one

Sharps Bros The Jack .223 Remington AR Lower, Tan - SBLR03BADLANDS

Sharps Bros The Jack .223 Remington AR Lower, Tan - SBLR03BADLANDS

Lower Receiver$307 · out of stockin 13% of them
Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger

Geissele Automatics AR-15 SSA-E X Lightning Bow Trigger

Trigger$335in 38% of them
Magpul AFG-2 Angled Fore Grip - Black

Magpul AFG-2 Angled Fore Grip - Black

Foregrip$24in 25% of them
FAXON Firearms 5.56 M16 Bolt Carrier Group Nitride TIN PVD

FAXON Firearms 5.56 M16 Bolt Carrier Group Nitride TIN PVD

Bolt Carrier Group$148in 25% of them
Breek Arms Warhammer MOD2 Micro Latch AR-15 Ambidextrous Charging Handle - FDE

Breek Arms Warhammer MOD2 Micro Latch AR-15 Ambidextrous Charging Handle - FDE

Charging Handle$47in 13% of them
FAB Defense GL-Core Black Recoil Reduction Buttstock - High-Impact Buttstock for Enhanced Shooting Comfort and Control - FXCIMPACTCPB

FAB Defense GL-Core Black Recoil Reduction Buttstock - High-Impact Buttstock for Enhanced Shooting Comfort and Control - FXCIMPACTCPB

Stock & Brace$110in 13% of them

Build Configuration Breakdown

Aggregated and anonymized data showing how builders use this product

Gas System

50.3%
Mid-Length50.3%
Carbine25.7%
Pistol11.4%
Rifle11%
Blowback1.3%
Other0.3%

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