Expo Arms Barreled AR-15 Upper Receiver - .300 Blackout - 8" - 7" M-LOK

This upper has an 8" barrel. Installing it on a lower receiver configured as a rifle with a shoulder stock makes the firearm a short-barreled rifle under the National Firearms Act, which requires ATF approval and a tax stamp before assembly. Know your federal, state, and local laws before purchasing.

The Expo Arms Barreled AR-15 Upper Receiver in .300 Blackout pairs an 8" SOCOM-profile barrel with a slim 7" free-float M-LOK handguard, giving short-barrel builds a compact, lightweight front end. It is built for pistol and short-barreled rifle projects where size and handling matter most.

Features:

• 8" SOCOM-profile barrel chambered in .300 AAC Blackout, 1:8 twist
• 4150 chrome moly vanadium steel with a salt bath nitride finish
• Pistol-length gas system with a generous port size, .750" gas seat diameter
• Threaded 5/8x24 muzzle
• 7" free-float M-LOK handguard, 6061-T6 aluminum
• 7 rows of M-LOK slots for lights, foregrips, and other accessories
• Anti-rotation tabs
• Hardcoat anodized black finish
• Bolt carrier group and charging handle not included

The pistol-length gas system with a generous port size supports reliable function with both supersonic and subsonic loads, and the 1:8 twist keeps a variety of bullet types stabilized. The salt bath nitride finish adds corrosion and wear resistance for hard use.

The free-float design keeps the handguard off the barrel for consistent accuracy, and the anti-rotation tabs keep it from twisting so mounted accessories stay where you put them. At 7" it keeps the front end light and easy to maneuver, with M-LOK slots on every side.

Note: the bolt carrier group and charging handle are not included.

Note: heavier buffer may be recommended depening on use case and ammunition selection

Expo Arms builds mil-spec AR-15 components aimed at hard-use builds, offering the rail space and durability serious shooters need.