Opinions on What Direction to Take This Colt Lightning In

[oldfoneguy]

I'm going to give the firing pin a shot. Even made from mild steel I can work by hand it will be stronger than brass.
I have a feeling this rifle is chambered in 22LR. I fit a long rifle in the chamber with ease. If the barrel will take it, long rifle is 100 times easier to find here than shorts. The barrel doesn't specify the round just 22 cal.
I was able to get a couple of shots down the barrel with the borescope after some scrubbing with a bronze brush. There is definitely still rifiling down there. I also have a shot with a hollow point long rifle in the barrel chambering perfectly set back from the throat rifling.