oooohhh.... yucky... screw builds are easier and stronger. you would be welding dissimilar metals. The trunion steel is not the same as the receiver steel, and it just doesn't work well without knowing exactly how to do it. I, too have seen the pics of a weld-job, and all of the welds were cracked and porous... not a job for your wire feed flux-cored rig. maybe with proper prep and a TIG machine.