Modern Sporting Muzzleloader Upper

Turn any “mil-spec” AR15 into a tack driving muzzleloader and catch all the hunts!

For our Modern Sporting Muzzleloader uppers, we use the same bolt action receiver from our UPR15 line. The receivers are machined from American 6061 billet aluminum with a pic rail on top and a 15″ MLOK handguard which  gives you plenty of real estate for any peripherals you might add.

The barrels are a 24″, 416R Stainless Steel, 1 -20 twist barrel from Preferred Barrels. Recoil from the .45 caliber projectile is tamed by our dual port muzzle brake. Secured and running along the top of the barrel and protected by the handguard is the aluminum ramrod with brass jag.
The bolt is machined from American 4140 steel and features dual extractors to ensure the spent 209 primers won’t get stuck.

Whether you’re an experienced muzzleloader shooter or looking to get into it, look no further. The Uintah Precision Modern Sporting Muzzleloader is it!



8 in stock (can be backordered)


  • .45 Caliber, 416R Stainless Steel barrel from Preferred Barrels, Cerakote finish
  • 24″ barrel
  • 1 – 20 twist rate
  • Dual Port Muzzle Brake
  • 4140 bolt, dual primer extractors
  • 6061 Billet Upper receiver
  • Aluminum ramrod with brass jag
  • 209 primer ignition
  • Pins to any “mil-spec” AR15 lower
  • This upper assembly is not a firearm, will ship directly to you and is legal to ship to any state.


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Uintah Precision has top quality Firearms and accessories at affordable prices.