This is a great model. Fully functional. If you spend some time on the fettling to get the action smooth it will cock and fire.
I have had to make a few mods to make everything work
1/ The firing spring needs to be relieved as per the photo. The black spring is correct
2/ The hole in the trigger needs to be enlarged to allow the firing lever to move freely
3/ The firing lever must be relieved as I have shown
Great model though, and easy to print.