ATI Milsport Barreled AR-15 Upper 5.56 1:8 Twist Nitride Barrel With M-LOK Rail - 16"

2 Reviews

Out of Stock



This American Tactical Barreled AR-15 Upper Receiver Group is chambered in 5.56 NATO and an M4 profile. With a 16” barrel and 1:8 twist rate, sending 55 grain projectiles down range and getting small groups has never been easier. The carbine length gas system is the ultimate in reliability to keep your rifle running in adverse conditions. Protecting the low profile gas block is a 12” 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
  • 16” Barrel with 1:8 twist rate
  • Nitride finish
  • A2 flash hider
  • Carbine length gas system
  • 12” 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.
See More


AssemblyBarreled Assemblies
Barrel CoatingSalt Bath Nitride
Barrel ContourM4
Barrel Length16
Barrel LiningSalt Bath Nitride
BrandAmerican Tactical Imports
Caliber Gauge5.56 NATO
Gas System LengthCarbine
Gas System TypeDirect Impingement
Handguard12 in M-LOK Rail
Muzzle DeviceA2 Flash Hider
Thread Pattern1/2 X 28
Twist Rate1:8

Ratings & Reviews

2 reviews

  • 5 stars
  • 0 reviews
  • 3 stars
  • 0 reviews
  • 2 stars
  • 0 reviews

You get what you pay for

by -

Barrel pin too small for slot in receiver. When they tightened it at the factory the barrel canted to the right. Bcg wont go into battery at all. Receiver and handguard finish is horribly mismatched. As usual Primary Arms was quick to ship.

Wrong handgurad size


Build quality is good but the handguard is not 12". I measured 10.25". The grenade launcher notch is exposed which would have been covered if it was actually 12".