Rainier Arms Base Piston 16" 5.56/.223 Upper Receiver Group - $575 shipped
|Submitted by JohnB, updated by boksaman 5 months ago (2014-10-14)|
Rainier Arms Base Piston 16" 5.56/.223 caliber Upper Receiver Group. The Rainier 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. The Rainier Piston Series system allows you to have an upper that will run cleaner, cooler, and longer.
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