I am not a gun guy, that being said if you know what you want I can weld it.
This was a 3 hour job as I had to watch the heat input as to not remove the temper in the top rails !
These are the tools that I used to do the job. A "third hand" to avoid arc strikes , brass backing with holes drilled oversized to the hole to be welded. These served as argon traps for 100% penetration and, limited the distance of the finished weld penetration.
The finished project only required that the surface of the weldements be sanded to a coat-able finish!
HAPPY WELDING !!!!