Introduction: K'nex 'semi Pump Action' Gun

Picture of K'nex 'semi Pump Action' Gun
Hi there. I made this gun today, and wanted to show it. It is a repeater (it shoots), and reloads the bullets from a tubular magazine underneath the barrel. With semi pump action, I mean that you  have to cock the pin manually, but you chamber the bullets via a pump. I had this idea a long time ago (a very bad prototype is on Mahmel's orange board), and decided to do it again.
I hope you like it, and please comment. Help is also appreciated, as it isn't near perfect yet.
It holds 3 bullets (in the video that's coming up soon, I only used 1, as I didn't cut the needed y-connector correctly
Update 1: 
- Cut a y connector in a special way, makes the feeding much smoother (this one was also needed on Bakenbitz's original mech)
- Made the barrel 1 connector longer, and added some sort of hop-up
- Different stock
- Different barrel internals. Bullets don't become stock anymore

- Bakenbitz for his lever action gun. I used the bullet ramp in a modified way, to incorporate the pump.
- Killerk, for the idea of the hop-up (inspired by this add-on on his Z35)

Video of the new update:


Element Force (author)2013-03-19

Dude you have so many awsome ideas you should build a PDW-57 like in Black Ops 2 (its an idea)

Thanks. I can try the PDW-57, but after I posted instructions for this. I hope to have these finished on Thursday (my shortest schoolday), but I have exams from Friday 'til next week Friday, so I don't know when the PDW'll be finished


Yeah. I posted the instructions for this one yesterday. Maybe I find some time tomorrow, or already later today, to start the PDW

I got it gold in black ops 2 prestige 2 level max! its my favorite gun :D

Nice! I tried the PDW, but it failed, pretty bad. Sorry :(

Vaetheon (author)2013-03-19

Cool, but whats the point of pulling the pin back then pumping it when you could just pull the pin back on a regular gun?

dr. richtofen (author)Vaetheon2013-03-20

The horizontal mag, I think. Thanks btw

Raz1r Knex Bull3t (author)2013-03-16

I am designing something a little similar to this. Except it as a vertical (as in up and down) removable mag, and I'm trying to allow the pump on my gun push the bullet from the mag into a separate chamber as well as pushing the firing rod all at the same time. It's going to be an innovative kind of gun.

Sounds cool! I had that sorta idea in my head for a tubular mag, but then I realized that with tube mags, the pin pull would be very short. So I made this. Looking forward to see what you come up with

I have the stock area finished for it, but I now need to work on the mechanism. It'll be tricky, but it's worth the shot. : D

Nice! The idea sure is worth a try:D

Yep. Oh and your my 1400th commenter. : D

tytiger33 (author)2013-03-17

When this is perfected I really hope to see instructions for this.

dr. richtofen (author)tytiger332013-03-17

I'll maybe post them today. I've fixed the barrel and feeding problem, and made a (in my opinion) better stock for it.

charlie-on-our-6 (author)2013-03-17

what sort of gun is clinging to the side in the second to last pic?

It's a spring airsoft pistol (beretta 90-two by Umarex). Used it to give a indication of the size

sandroknexmaster (author)2013-03-17

Haha, credits: "This gun: Me" =D
Nice, I like pump action guns.

=D Thanks!

Nice bro. Good to see a shooting gun from you. =D

You are very welcome. Hows life?

Life's been good. Found some new music I like, etc. So yeah, can't complain :D
And you?

Good, good. I like music a lot, but I have not had the chance to really get into music, as I have spent many hours in speech and debate. Me? I have been fine, but again, busy.

Ah. I see, I'll be busy in the end of next week (exam week coming next Friday). Speech and debate is kinda interesting (had it previous school year, in the end)

knex dude 2000 (author)2013-03-16

lol thats so cool. is it based on a semi auto or fully auto?

Well, actually neither, hehe. The bullet lifting mech was based on Bakenbitz's lever action gun

hawk45 (author)2013-03-16

nice and awesome!

dr. richtofen (author)hawk452013-03-16

Thanks =D Are you working on something?

Knex.X (author)2013-03-16


dr. richtofen (author)Knex.X2013-03-16

Thanks =)

Johnhall44 (author)2013-03-16

o= neat

dr. richtofen (author)Johnhall442013-03-16

Thanks =D

Johnhall44 (author)dr. richtofen2013-03-16

that was fast =p

dr. richtofen (author)Johnhall442013-03-16

Hehe. Have my mail open in one tab, music in the other =)

Johnhall44 (author)dr. richtofen2013-03-16


dr. richtofen (author)Johnhall442013-03-16

Yep ;)

About This Instructable




Bio: Hey there. I won't add too much info here, as it'll show up as one big paragraph.
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