I don't know specifically about the GPR. But I've heard that the TC flint locks have different inletting than the percussion locks. The flint locks can be adapted, but I'm not so sure that they can be changed back & forth at will.
At least that's the way that I understood it was that they couldn't be.
Maybe the percussion locks can fit into the flint lock mortice, but not the other way around.
I don't know whether the GPR lock inletting is different from the TC guns or not. But their locks are almost the same to the point of being almost identical.
However I could be mistaken about how different that the flint locks and percussion locks are to being swappable.
Last edited by arcticap; January 4, 2013 at 08:48 PM.