Hi, thanks for your time I'm fairly new here. I am working on a project for school to make a laser gun. I was wondering what would be the best way to detect being shot. Should I use an IR module or an IR receiver diode? I am planning on using an IR transmitter diode to send the IR signal
I am planning on using an IR transmitter diode to send the IR signal
Don't do it with lasers as they can damage your eyes or blind you and IR lasers are more dangerous as you wont know someone is shining it in your eyes until it's to late.
I suggest you do some research on how commercial laser tag guns work. For example: this page. As Rive correctly mentioned, IR lasers can be very dangerous. The beams can damage the eye, especially since the IR light doesn't cause a blink reflex.
 of course this is assuming you want to build a laser tag gun. If you want to build a laser gun which will actually cause fire, look for a different forum.