ATI Milsport Barreled Upper 5.56 1:7 Twist Nitride Barrel with M-LOK Rail - 7.5"

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NOTE: This upper receiver has a barrel that is less than 16” in length and is intended for use in AR pistol or legal short-barreled rifle builds. Other configurations may violate Federal law.

This American Tactical Barreled AR-15 Upper Receiver Group is chambered in 5.56 NATO and a medium profile. It features a 7.5” barrel and 1:7 twist rate for optimal stabilization of heavy grain projectiles. The pistol length gas system is the ultimate in reliability to keep your rifle running in adverse conditions. Protecting the low profile gas block is a free float handguard with M-LOK slots for attaching grips, lights, and other accessories. This upper does not include a charging handle or BCG.

  • 5.56 NATO chamber
  • 7.5” Barrel with 1:7 twist rate
  • Nitride finish
  • A2 flash hider
  • Carbine length gas system
  • Free float handguard
  • M-LOK attachment slots
  • 7075-T6 aluminum forged receiver
  • Hardcoat anodized black finish

The Mil-Spec upper receiver is forged from 7075-T6 aluminum with a hardcoat anodized finish and comes with a forward assist and dust cover already installed. The full length picatinny top rail is perfect for optics and back up iron sights.

American Tactical Inc. is a worldwide importer of firearms, ammunition and tactical equipment to the United States of America. While a relative newcomer to the firearms industry, ATI has established a reputation for many high-quality products.


Barrel CoatingSalt Bath Nitride
Barrel ContourMedium
Barrel Length7.5
Barrel LiningSalt Bath Nitride
BrandAmerican Tactical Imports
Caliber Gauge5.56 NATO
Gas System LengthPistol
Gas System TypeDirect Impingement
Muzzle DeviceA2 Flash Hider
Thread Pattern1/2 X 28
Twist Rate1:7

Ratings & Reviews

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Can't GO WRONG!!!

by -

Ok, So first off, i purchased this for a special pistol build for by bother as a birthday surprise. OF all the companies i have purchased parts from, --Bear Creak-- Brothers in Arms, PSA, Spike Tactical, .. YOU NAME IT, THEY GUYS SHIP and DELIVER The FASTEST HANDS DOWN!!! Not taking anything away from the competition. It's just facts!
<br>Now the product. Great finish, good look, and I can't wait to test it. Before I give it to him, i will upload photos. SO far Primary Arms has this build off to a GREAT START!