this is the knex rifle I showed as a forum. it was mainly designed for looks and has OK range. its barrel is detachable and reduces range when attached.it has a carrying handle which is also detachable, and a bipod. it uses a basic hopper to load as I am not very good at designing new hoppers. feel free to alter or add to this design.

Step 1: Main Barrel

put together main barrel parts and combine.

(ignore extra parts in picures 4 and 5)

Step 2: Handle and Trigger

construct handle and trigger sections and add to main barrel

Step 3: Ram

making the ram

1, make these bits
2, close up.
3, make this
4-6, combine
7, add to main barrel

Step 4: Stock Part1

this is probably the longest and hardest step, so pay attention to the order of the pics and the orientation of the parts

1-4, make this part
5-7, make this part
8, make these
9, add them
10, combine

Step 5: Stock Part2

continue making the stock

1-2, combine.
3, make and add this
4, make this
5, add it
6, put on the orange connector
7, make and attach this
8 make and attach this

Step 6: Stock Part3

the final part

1, attach this
2, attach this
3, put these on
4-5, put through ram and onto barrel
6, attach black y connector

Step 7: Hopper

building the hopper.

1-3 make this
4 make this
5 combine and add to barrel

Step 8: Supports

construct the supports that go from the stosk to the main barrel

1 construct upper supports
2 construct lower supports
3 combine and add the grey connector
add to the stock (pic4) and the hopper (pic5)

Step 9: Carrying Handle

constructing the handle

1-3, construct the handle
4-7, attach onto hopper and supports

Step 10: Barrel

barrel

1-2, build this
3, build this too
4 build these
5-6 combine them
7-8 add these white connectors
9-10, make the front handle
11, attach
12-13, make these
14-15, add them
16, slide grey (or orange) rods up through the bipod
17, attach to the hopper and
18, add orange connectors.

you don't have to use the barrel, just don't attach it.

Step 11: Adding Bands

attach rubber bands to the ram and trigger as shown. the ruberbands are the same on both sides.

To fire, take off the hopper cover and load in up to 12 blue rods.
(11 for best performance) puul back the ram by pulling on the two yellow rods, and pull the trigger to fire.