K'NEX Gun: Red Competitor (R4)

About: K'NEX gun builder here at Instructables. More or less retired from the community, but I still pop in now and again.
Some time ago, JonnyBGood and I were planning on doing a collaboration on a FAD. Needless to say, that fell through. The FAD just had too many weird edges and bumps. Then we thought about doing a concept gun, and decided to mod the flipping snap out of the K2 V.2 (see pic #14). JBG did not succeed as well as I did (not from lack of trying), and these are the pics to my burst-fire rifle, the Red Competitor / R4.

With a 10 round magazine, a ROF of of 4 rounds per second, and a comfortable body and handle, this is one of my most innovative guns.

Improvements over the K2 V.2 include:
  • Comfort (the K2 V.2 was really uncomfortable)
  • Speed (I think that I can pump the Red Competitor / R4 faster)
  • Magazine (the K2 V.2 had a TR8)
  • Piece usage (the R4 uses a significantly less amount of parts)


-The Red Book of Westmarch

Teacher Notes

Teachers! Did you use this instructable in your classroom?
Add a Teacher Note to share how you incorporated it into your lesson.

Be the First to Share


    • Book Character Costume Challenge

      Book Character Costume Challenge
    • Made with Math Contest

      Made with Math Contest
    • Cardboard Speed Challenge

      Cardboard Speed Challenge

    67 Discussions

    Hey man! Well, to be honest, I don't know if I could help you. Let me check if I can get internals from my computer... Nope, sorry bro, I don't have any internals. As far as the changes wen't, the body was the most significant. The internals were changed, somewhat, but the body was the most significan improvment.

    Well, it is there to provide the user with leverage. If you only had one place to put your hand, you would not be able to operate this gun effectively. BTW, punctuation and capitalization would not hurt you. XD

    I haven't been on in forever, as my K'nex has been taken away, but is nice to see that the community is continuing without me. Although, I am going to try and figure out something to post eventually. Keep on K'nexing, everyone!

    1 reply