Much like the weight to power ratio of a car, if you lower the weight of the projectile it should increase the speed/ power of the delivery. Has anyone done any investigations into how good a pneumatic can fire a projectile...I’m thinking of testing micro weight projectiles of less than a gram. They...

Guys, Im in Sydney and new to all this, whats the silver thingy/trigger connected to the clear plastic tube in the pic on page one ?
And where do I buy one of those ?
And is anyone else in Sydney because Id like to meet up and learn all I can.
Thanks, Brett.