Need a script, please?

[Wanish]

Hey guys!
So, i built a gun, and the problem is, it cocks the trigger faster than the reload, and it causes the bullet to collide with the trigger, which is a killer, and fires the projectile mid load. So i slowed down the cocking, now its k, but it is too slow
Can any1 give me a script, which sets the collosion with group C when the bullet reaches a given coordinate? i don't really want to rebuild the whole stuff, but lesson learned, make the bolt and trigger move as one next time

[Wanish]

Ah, okay guys, i got it i put a laser perpendicular with the chamber, and then script the powder in the bullet to change collosion to C, same as the trigger when hit by the lazor so cool