This is my new knex pistol it uses a new, pretty efficient firing mechanism. I guess you call it a hammer you pull the hammer back which rotates back, it locks into place in four different distance and when your ready to fire, pull the trigger. With only two rubberbands i was able to fire it 30+ ft on a stright angle with good power. (Not aiming 45 degrees up in the sky) its a single shot so you have to keep reloading :( It has a true trigger as well. It uses very few pieces (about 100 and something).
Step 1: The Hammer
Pretty simple step