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Rainier Arms AR-15 Combat Series Upper Mod 2 18" (M-LOK)

Out of stock

Rainier Arms AR-15 Combat Series Upper Mod 2 18" (M-LOK)


Our Combat Series is built with high quality components while keeping the costs down. Why buy a cheap quality upper when you can buy a custom high quality upper at an affordable price? The Rainier Combat Series Upper starts off with a Cold Hammer Forged, Chrome Moly Vanadium (CMV) chrome lined barrel with Direct Impingement gas operation. We also free float the barrel for better accuracy. Our barrels are matched to the bolt for best results. All our custom shop uppers are built using the highest quality of components, test fired and ready to go. When reliability matters most, professionals choose Rainier. All our custom uppers come complete with a limited life time warranty on all parts & workmanship.

Component List:

  • 18" Cold Hammer Forged Chrome Moly Vanadium Steel Made of Mil Spec M249 Machine Gun barrel steel, with heavy M249 Chrome Lining, (appx. 2 times as thick as an M4 or M16) 1:7 5.56MM - Rifle Gas
  • Rainier Arms Forged Milspec M4 Upper Receiver - GEN2
  • Pinned Low Profile Gas Block
  • Fortis REV 2 Free Float Rail System - 14" MLOK
  • Match Nitride Full Auto BCG
  • Fortis Hammer Charging Handle
  • Rainier Arms Compensator XTC 2.0
  • 4lbs 3.2 oz
More Information
SKU RACombatUpper18
Manufacturer Rainier Arms, LLC
Finish Stainless Steel
Barrel Length 18"
Caliber .223 / 5.56
Profile Medium Contour
Gas Length Pistol
Configuration 1/2X28 Thread
Option AR15
Rail Length 12"
Mount Picatinny
Size 9 Slot