The TacFire Rifle Upper Assembly, 5.56x45mm NATO, 16-inch Black Nitride Barrel, 7075-T6 M-LOK (brand part number BU55616) is a complete, ready-to-run upper for a full-size 5.56 AR rifle build. TacFire chambers it in 5.56 NATO, safe for both 5.56 and .223 Remington ammunition, and tops the 16-inch Black Nitride barrel with a black-anodized 7075-T6 aluminum receiver and an M-LOK handguard. It ships completely built with a bolt carrier group already installed, optic-ready with no iron sights, and drops directly onto any compatible AR lower.

Key Specifications

• Chambered in 5.56x45mm NATO, safely running both 5.56 and .223 Remington.
• Barrel length of 16 inches for a full-size rifle build.
• Barrel finish: Black Nitride for corrosion resistance.
• Receiver machined from 7075-T6 aluminum, black anodized.
• M-LOK handguard for lightweight accessory mounting.
• Ships with no iron sights, optic-ready.
• Ships completely built and ready to drop onto a lower.
• Includes a bolt carrier group.
• Ships at approximately 4.9 pounds.

Frequently Asked Questions

Does this upper include a bolt carrier group? Yes, it ships completely built with a bolt carrier group installed.

What ammunition can it run? Both 5.56 NATO and .223 Remington.

Buy the TacFire Rifle Upper Assembly, 5.56x45mm NATO, 16-inch Black Nitride Barrel, 7075-T6 M-LOK

Build a full-size 5.56 rifle with an AR15 upper ready to drop onto your lower. Order it from our Lubbock, Texas gun shop for fast, insured shipping.