TacFire BU9MM4 Pistol Upper Assembly AR-Platform 9mm Luger 4\" Black Nitride/Black Anodized Finish
All TacFire upper receivers
Click to see full view
TacFire
Overview
The TacFire BU9MM4 Pistol Upper Assembly is a complete upper receiver designed specifically for the AR-9 platform, chambered in 9mm Luger. With a pistol-length gas system, this upper provides reliable cycling and operates effectively in compact builds, making it suitable for short-barreled configurations. Builders often integrate this upper into pistol builds that prioritize maneuverability and ease of handling in tight spaces.
Specifications
TacFire BU9MM4 Pistol Upper Assembly AR-Platform 9mm Luger 4\" Black Nitride/Black Anodized Finish
Available Merchants(5)
Prices checked
Price Alert
Build history on GunPartPicker
Builders have been adding the TacFire BU9MM4 Pistol Upper Assembly AR-Platform 9mm Luger 4\" Black Nitride/Black Anodized Finish to their builds on GunPartPicker since March 2026. All time, it ranks #330 of the 1,683 upper receivers builders have added.
It was in stock most days in September 2026, and today 4 of the 5 retailers we track have it in stock. It dipped to $253.99 at KY Gun Company for a stretch in September 2026, under its usual $268.79, so sales do come around. Buying today, the lowest price is $241.33 at BattleHawk Armory, which matches the best price we saw in September.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 37 retailers
Not sure which upper receiver to pick?
We ranked every upper receiver by how often it shows up in real builds on GunPartPicker.
Read the guide: Most Popular AR-15 Upper Receivers →Check it against the live catalog:
Frequently Built With
The part most often added in each category by the builds that include this one
Spike's Tactical Spider 9mm AR-15 Lower - Colt
Magpul M-LOK Handstop KIT - Black
FAXON Firearms 9mm AR-15 Bolt Carrier Group for Glock or Colt Magazines - Nitride
Breek Arms AR-15 Warhammer MOD2 Ambidextrous Charging Handle Black
Timber Creek Enforcer AR Pistol Grip, Purple Anodized - E ARPG PPA
Rise Armament Advanced Performance Trigger, Red - RA-535-RED-ARP
No reviews yet. Be the first to review this product!