I have a Rock River upper with a mid-length gas system with a 1/9 twist 16" heavy barrel. It also has a 11" Troy Industries Battlerail Bravo. This sale does not include the bolt carrier. This upper has about 300-400 rounds through it and is like new. The reason of selling is funds for another project. The ONLY thing I would like trade for this is an Aimpoint Comp m4 or an Aimpoint Comp m4s. Looking to get
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