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Rainier Arms, LLC

Rainier Arms Combat Series Upper Mod 2 18

Rainier Arms Combat Series Upper Mod 2 18
Only 4 left

Availability: In stock




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


Additional Info

Additional Info

SKU RACombatUpper18
Manufacturer Rainier Arms, LLC
Finish No
Barrel Length 18"
Caliber 5.56
Configuration No
Option No
Gas Length No
Height No
Rail Length 14"
Mount No
Profile No
Reticle No
Co Witness No
Size No


Customer Reviews (1)

Very decentReview by
Upper is solid and great craftsmanship. BCG is top notch and even the charging handle is easier to draw due to the butterfly design.

Only gripe is the upper and BCG came in dirty. It was obviously test fired several hundred rounds. I scrapped off a lot of fouling and dirty lube.

Its a solid design and would still buy it again.
(Posted on 2/9/2017)

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