i took apart my nerf disk gun and changed the spring position so that it would be more pretentioned and thus have more force.
the pic. shows needed tools
first take out the shown screws
the black box next to the gun is the end cap for the stock attachment point
important to note that the ones indicated in pic 2 are longer than most
pic 3 is of all the types of screw taken out in this instructable and the # of each
note that the very short and the silver screws don't come out till later