Are you low on pieces, i know i was. i spent ages looking for a good gun that dosnt need alot of knex, so i made one myself.

Step 1: What You Need..

yeh.... you might have to tilt your head.... can you flip images on this?....

Step 2: Structure

4 blue connectors
2 orange connectors
2 yellow connectors
2purple connectors
2 grey pipes
3 white pipes
2 yellow pipes
3 grey spacers

Step 3: Trigger(not Really) and Wheel

3 white connectors
4 black connectors
2 purple connectors
1 red connector
2 light grey connectors
6 blue spacers
4 whited pipes
2 blue pipes

Step 4: Put It Together

its pretty simple to load the rubber band( on the orange thing and pull it back to the wheel...DUH) and once its loaded just pull down the lever thing...
try to use small rubber bands (mine work well at around the length of a knex connector piece)
give feedback on ur thaughts and find a better one shot RBG for me( i always want more power!..lol)