Yeah, I would if you can add an option to custom the input, that would solve the problem too. So every player can adjust the input as they want.
I just realised that I sell the template here on itch.io, but I don't have the demo of my FPS on Rails here.
Try it in the Scirra Arcade:
https://www.construct.net/en/free-online-games/test-demo-fps-rails-template-4963...
Go full screen before playing, otherwise you will have issues with the mouse.
To reload a single bullet for gun and rifle, move the wheel of the mouse up and down to imitate the real life hand movement.