its very easy to make but you need a lot of yellow connectors and grey connectors. the ram is a orange connector with a grey rod on it. you HAVE TO tape the connector on the grey rod, otherwise you damage the orange connector.
feel free to make mods on this but say to me if you do!!! =)
Step 1: Making the (double) Barrel
Step 2: Making the Grip
Step 3: Adding Rubberbands and Make the Rams
add the rubber bands as shown. if you read good in the previous step you already add 2 rubberbands before you add the red connectors. i did it wrong first so you see it wrong on the pictures. the rubberband has to be under the red connectors cause if you dont do that the ram should bow if you load ;-)
Step 4: Loading and Firing
here's a video of firing the gun on a cardboard box =)