The old 513S I have had a barrel replacement and the Model T isn't quite stock either, but rather is in an Olympic match configuration. Doesn't matter, they both shoot lights out.
Footnote of sorts, I have killed quite a few critters, mostly squirrel with the BB caps and a small number with the CB caps. For reasons not entirely clear all the BB caps killed cleanly with one shot, but the CB caps, well, about half the squirrel required a second shot. No idea why. Have whacked a number of possum and 'coons with the BB Caps also, one shot and flop.