Mine is a is a K'NEX version of a 40 mm system, but is not, technically, a replica of any particular gun. I just thought it would be cool to bring up a new "concept" to the K'NEX community on instructables.
Looks kinda cool (IMO)
Has good range for a grenade launcher: 40 ft.
Has good close range power
Easy to handle
Has a pin-guide (you are welcome Knex.X) XD
Has detachable mag/inner barrel
Can shoot shotgun shells
Has handle guard
Might be useful in K'NEX wars
Has true trigger
Trigger needs some help to block
Not a replica
Kinda difficult to load
Well, there you have it. The R40mm System. I would really like some of you guys to really just take this and use it to your advantage. It is my gift to you all. Have fun modding and looking.
-The Red Book of Westmarch