The funny thing about metal fatigue once it's had it's temper tinkered with by such things as house fires is- there is no set rule to when it will stretch, crack, or totally let go.
Whether you shoot it 5 times or 500 times- you don't know if something bad will happen the 6th or 501st shot. And just for sake of argument, if the worst happens to your customer- who do you think his survivors will line up to sue first?
If nothing else, send it back to Ruger. They may do hardness testing, etc- or they may do you a favor and scrap it as unsafe. Let the folks who've been building firearms longer than us make the important decision.
Rednecks... Keeping the woods critter-free since March 2, 1836. (TX Independence Day)
I'm going to use the words "clip" and "Long Colt" every chance I get. It grinds my gears to see new members attacked when we all know dang good and well what's being refered to.