Tacfire .300 Blackout 5\" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, M-LOK Handguard - BU-300-5
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TacFire
Overview
The Tacfire .300 Blackout 5" AR-15 Complete Upper Receiver is a ready-to-install assembly that includes a bolt carrier group and charging handle, making it an ideal choice for builders looking for convenience and compatibility with the AR-15 platform. Featuring a compact 5-inch barrel length, this upper is designed to optimize performance for the .300 Blackout caliber, allowing for efficient suppression and excellent maneuverability in close quarters. Commonly seen in lightweight and tactical builds, this upper receiver is a solid option for those aiming for a compact firearm setup.
Specifications
Tacfire .300 Blackout 5\" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, M-LOK Handguard - BU-300-5
Available Merchants(5)
Prices checked
Price Alert
October 2026 on GunPartPicker
Tacfire .300 Blackout 5\" AR-15 Complete Upper Receiver with Bolt Carrier Group, Charging Handle, M-LOK Handguard - BU-300-5 ranked #360 of the 844 upper receivers builders added on GunPartPicker in October 2026. Builders have added it to their builds on GunPartPicker. Since April 2026, it ranks #550 of the 2,061 upper receivers builders have added.
Availability is good: it was in stock at one retailer or another nearly every time we checked in October 2026, and today 3 of the 5 retailers we track have it in stock. Buying today, the lowest price is $356.37 at KY Gun Company, above October's low of $314.78, so a better deal may come back.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
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Frequently Built With
The part most often added in each category by the builds that include this one
Strike Industries Latchless Charging Handle - Red
Battle Arms Development Workhorse Stripped Lower Receiver 5.56 NATO / .223 Rem
FAXON Firearms TIN M16 Bolt Carrier Group
Rise Armament AR-15 Le/military Single-Stage Trigger 4.5lb
Timber Creek M-LOK Enforcer Mini Angled Foregrip, Blue - M EM AFG B
Kriss Defiance DS150 Buttstock, Black - DADS150BL00
Build Configuration Breakdown
Aggregated and anonymized data showing how builders use this product
Gas SystemBased on real build data showing which gas system lengths builders use with this product.
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