L&R locks will almost drop in. I have two guns I put them on , a CVA and a Lyman, both are flint. I had to remove wood on both under the lock but that was because L&R uses a heavy "V" spring. On a T/C it may be alittle different. I don't have my T/C anymore, sold it, I'd put an L&R on it if I still had it. They make a good drop in lock, much better than what T/Cs come with. As far as changing your gun over to flint you may have to do alittle more fitting for that. I'd do more research before speading that kind of money. I got mine from RMC and I spent 140 each..ouch..Good luck...ssettle