Specifications include, but are not limited to: The County will be seeking to trade in twenty-eight (28) Rock River LAR-15’s with the following specifications: Rock River Arms LAR-15 Feature Description Caliber 5.56 NATO Chambered for 5.56 MM and .223 caliber Upper Receiver Forged A4 w/bolt carrier group Barrel 16-inch lightweight, chrome lined, 1:9 Twist Front Sight RRA Flip Front sight w/ Gas Block Assembly with tritium front post/ Some uppers may have front A post Rear Sight A.R.M.S #40 Flip up rear sight Charging Handle Ambidextrous charging handle (black) Muzzle Device A2 Flash Hider/ 1.2:28 thread; Solicitation: St. Charles County is soliciting bids from Respondents qualified, responsible and willing to provide the following Goods and/or Services in compliance with all solicitation specifications and requirements contained or referenced herein. General Description: To provide the St. Charles County Police Department with twenty-eight (28) .223 caliber semi-automatic uppers as per specifications called for herein: Rock River Arms 10.5-inch (AR0366B) A4 Upper Half V2 Feature Description Caliber 5.56 NATO Chamber for 5.56MM and .223 Upper Receiver Forged A4 w/bolt carrier group Barrel 10.5-inch Chrome lined chrome moly; 1:7 Twist Front Sight Magpul MBUS Pro Flip up Rear Right Magpul MBUS Pro Flip up