Contact someone who could machine a reciever for this type of gun. It's very doable. If you sent the current plastic body into Ken at KP Customs, I'm almost 100% certain he could machine an aluminum version. Then he could powdercoat it lol.
Talk to Ken about this, I bet you anything he can do it.
Btw, welcome to PBN. Don't worry about getting flamed, you present yourself better than some idiots who have been here for years.