I have one new factory built NEW Rock River Arms lower receiver with LEO markings and std. trigger and M4 6 position stock, I would like to trade for AR15 upper. Uppers wanted are RRA or Bushmaster M4, super light carbine uppers or DCM does not have to be new. Prefer chrome lined bores. I will throw in NIW mags or cash to make even. Please email with what you have. I don't get to read IM's often so email would be best. I also have this upper for sale in antoher thread for $310 shipped.