I am a new guy here. I have had Mini-14's in the past, and enjoy shooting them very much. I recently purchased a slightly used one, and cannot find out much information on it. It is marked as a restricted LEO firearm, and has an 18 inch barrel (including the suppressor). There is no bayonet lug attachment. It is a 580 series, according to the serial number. The barrel is not tapered, and I am wondering if that is a good or bad thing. Also, the receiver is machined for scope rings. Any additional information would be appreciated.