Mig welded on a scope base? Does that work? I know there both steel but I thought it had to be silver soldered and a heat sink used and a bunch of other stuff that I know nothing about. I could mig weld one on. Sorry no info about choke tubes really i only hav a mod that ive use with steel and hevi shot for geese and a cyl bore tube that I've shot some slugs through. That rig your talking about would make a nice foster slug shooter with a cyl bore tube.