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Rainier Arms Base 16" Piston 5.56MM Midlength AR15 Upper Adams

Rainier Arms Base 16" Piston 5.56MM Midlength AR15 Upper Adams

Part Number:RA-B16P
On sale: $682.45
Retail Price:$749.95
You Save:$67.50(9%)
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Rainier Arms Base 16" Piston 5.56MM Complete AR15 Midlength Upper Adams

Description: Rainier Arms Custom

Our Piston Series are built in collaboration with Adams Arms Piston Kits. The 5.56 Midlength Base 16" Upper is a standard mil-spec upper that incorporates the patented Adams Arms technology. The midlength piston system will give you the benefits of a longer forearm by giving the user a longer, more ergonomic grip, a longer sight radius between the front and the rear sight for quicker sight acquisition and less felt recoil. The piston system parts and the barrel have been treated with salt nitride Meloniting process making them harder and more corrosive resistant than hard chrome. Our Piston Series system allows you to have an upper that will run cleaner, cooler, and longer than any other AR upper you own.


  • Rainier Arms Forged Mil Spec Upper Receiver
  • Voodoo Barrel: 5.56mm NATO 16" Government Contour
  • Barrel Material: 4150 Chrome Moly Vanadium Steel
  • 1:7 Twist
  • Muzzle Thread Pattern: 1/2"-28
  • Barrel Finish: QPQ Melonite / Black Nitride
  • M4 Feed Ramps
  • Bolt Carrier: 1-Piece w/Integral Piston Strike Face
  • MP Tested Bolt
  • Rainier Arms Compensator
  • Gas System Length: Mid, Short Stroke Piston Operated
  • Handguard: 2-Piece Polymer, Mid-Length


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