The best 8-bit lightgun experience can be achieved by using a Famicom Gun! This thing is fucking BADASS!!
Sure, it looks great and classy (especially compared with the US/EU zapper), but what you can't see on the picture is that the insides are MECHANICAL and WORKING.
You can actually pull back the hammer and it'll stay there until you pull the trigger... then it makes a loud *clack* sound, not just the *click* from the trigger like all the other lightguns. You can also "empty" the whole "cylinder" by holding back the hammer and pulling the trigger repeatedly.. like a real wild west gun.
I got this baby last month in the mail and I played Wild Gunman for hours every day for days. Haven't been this hooked to a lightgun game since House of the Dead 2, and this one is 15 years older and doesn't even have any variation in the settings.