I think you know well enough not to weld on the thin sheet metal of a staple gun at least nothing that holds over 10k psi. A strap over the top might help or just add to the shrapnel.
Either way I'm not standing close to that thing.
Although this might be something that I may have tried, but alas, it is not my invention. Just a photo off of the good ol' internet.
It looks quite do-able and if I ever welded one, I can guarantee it would hold(45 years maintenance and fabrication welding on class 8 trucks and heavy construction equipment).
I probably would have put a reinforcing band around the chamber tying it to the mechanism! How about you guys?