[NightKnight]

I was thinking about the magnetic stops that some use to get more velocity out of their blowgun, and I was wondering if there are any magnets that have a field that is deep but not wide. In other words, are there any magnets that are strong but have a narrow field of affect. That would allow a projectile to be held in place, but not slow down the acceleration once the dart/projectile has moved past the magnet.