Forward Assist Knex Slingshot (the Real One! Vote for It in the Contest or Whatever!)

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Introduction: Forward Assist Knex Slingshot (the Real One! Vote for It in the Contest or Whatever!)

About: meh... is this textfield necessary?

OK... Soooooo... I know this is a single shot rifle, and I know it isn't the easiest to load, but hear me out! OK?

I had an idea of making a gun that would initially hit a round, then hit it again (kind of like a hammer gun inside a bolt.)

although none of the original ideas worked, this one did... and does. it has the main ram hit it and push it forward, and the other ram slows down a bit after that... the round slows down enough to make contact with the ram, and kind of works like a compound Newton's cradle. I'm getting over 100 ft of range with normal rods, and easily 150 to 160 with fin ammo.

FIRING DEMO: https://docs.google.com/file/d/1AJJoD3ab8-cPBLOoG5rtHQGvFIo8u3GHRQ/edit?usp=docslist_api

I now have several bandages on my fingers from working on it and having the trigger mech fail while working on the barrel... so sorry if it isn't as pretty as it could be, I need to set them down for a couple days now and get feeling back into my fingers.

now... onto the specs!

range: read the description about 4 inches above this depending on what device you're using to read this

power: holy crap, I have holes in my wall!

comfort: very comfortable, as much as I can tell through my leather welding gloves

sights: very nice, quite accurate

accuracy: fantastic, I can hit a CD at 50 feet easy

looks: I'm biased as can be and right now I'm afraid of the thing no matter how good it is now...just look at the picture and judge for yourself

reliability: pretty good, sometimes breaks parts, and if the trigger goes you need to make sure your fingers are out of the way when you put the round in otherwise the meat grinder will be something you'll feel quite comfortable letting 2 year olds play with while plugged in

build time: if your fingers don't get caught, probably around an hour and a half...

why I said forward assist: yes I know that on a real gun it's just to help seat a round that didn't do so correctly, on this one it sets the round up for the secondary firing

and now, have fun!

disclaimer: NEVER IN THE HISTORY OF MANKIND HAS SOMETHING AS LETHAL AS THIS BEEN INVENTED... ONLY POINT IT AT PEOPLE YOU REALLY WANT TO KILL AND KNOW THE STATUS OF CAPITOL PUNISHMENT WITHIN YOUR STATE BEFORE DOING SO

Step 1: Building It!

all in one step... I'm terrible at instructions so if someone wants to make one that would be fantastic!

anyway... advanced builders have fun!

and sorry for the terrible pictures, and the fact that they may be out of order is because I am entering this is the contest and had to remake it

K'NEX Contest

Runner Up in the
K'NEX Contest

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    34 Comments

    Woot! Yay! (pro membership AND a t-shirt! What could possibly be better...other than addition to my knex collection...ooooh whooopeeee I got that too!)

    I just found out now! (yay!)

    Thanks, I really thought my pullpup was more revolutionary mechanism wise...but oh well :P

    initial pics of the new mag feed design. advanced builders feel free to try it, I'll be posting instructions later this week for everyone else.

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    here's a firing demo: https://docs.google.com/file/d/1s2No0KgQLzWanoEKTltOrGATolVqQiR-BA/edit?usp=docslist_api

    ignore the first shot, it got shifted too far away from the bolt. the second is a better demo

    Yup... not much avoiding injury with this one, have to make sure it's only pointed at terrorists and such :p

    just got it working with a magazine! finally! so far it works like a double bolt action pin gun, with a 1.7ft or so pin pull (pull back pin, pull back ammo loading bolt... pull back loading bolt multiple times for shotgun.) still working just a bit on the feed of it, but so far it loads a round and chambers it without catching any other rounds about 60 percent of the time. hoping to make a new instructible tomorrow if all goes well. wish me luck!

    now that I'm on vacation I'm working really hard to get in a repeating bolt load mech for a magazine and such. stay tuned!

    Hey it's a cool gun and has earned my vote! Let's see if you win!

    1 reply

    thanks man! maybe one of the lower prizes, I mean I really can't compete with some of the ball machines and roller coasters.

    it's maybe 15 pounds... if I really gear it or something maybe. probably not...

    3 replies

    Ummm, is your gamertag Dreamwave101 by chance? Mine is KnottyThought1, you can add me if you wanna play Destiny or Halo Reach or any other game! (If it is Dreamwave101, lemme know. You're already my friend in that case!!!)

    I don't have an Xbox, I just played it at a friend's house at one point

    Hey if you want to play Halo (Reach) or Destiny or any other game, add me on Xbox 360! My gamertag is 'KnottyThought1', without the apostrophes.

    I've played maybe an hour of halo reach at most, not really a gun expert in that area ?