i was looking at airsoftparts.ca and im interested in the King Arms OP-style reflex sight
the description says that it fits on 20mm rails? I'm supposing I would need a rail or some sort for my glock? I just never seen these sights in action with a pistol. Only still images but they don't show anything. I know this may be a stupid question but does the mounted refelx sight move with the slide when the slide cycles?