Hello, I have been range shooting rimfires a lot and want to set up a backyard target and get a PCP pistol or bullpup or submachine size gun. I would really prefer semi maybe with full auto option. I do have neighbors so maybe something not terribly noisy. I currently have a Sig CO2 semi auto which is a fun little gun but I don't think Co2 is all that viable for how much I would be shooting. It is a bit loud as well but I canuve with it. It was like $119 and I am willing to go to $800 or if needed. Going to the range and buying ammo gets pricey so I am ok with an investment. Any suggestions would be appreciated.