Don’t you need SNAPCAPS for Dry Firing?
For some weapons, not for others. Read the manuals for the ones you want to use that way.
Depends on the gun.
But if someone is a Glock Nerd, the SIRT gun isn’t bad and not too expensive.
But if you have the money, you can get a Red Glock, G17P, Gen5. Identical to the real thing in every way except it won’t shoot. Weight, action, mag changes, trigger reset.