What is a block trigger?

A block trigger,like on a knex gun.

Comments

[Master_Zane]

It is a connector (Usually a orange connector) that when it is pulled down, it blocks the barrel so that nothing can pass it. And when you pull it up, the projectile passes.
Here is a example:
http://www.instructables.com/id/Knex_Button_activated_grenade_launcher/

[TOMNDAN]

ok thats what it is.

[Master_Zane]

Thanks for the best answer.