Introduction: Mechanical Pencil Gun With Automatic Feed

Picture of Mechanical Pencil Gun With Automatic Feed

I modified beam's Mechanical Pencil Gun to have an automatic feed with just two rubber bands, a mechanical pencil, and a bic pen, and some around the house appliances.

Step 1: Materials

Picture of Materials

For this project, you will need:

1 standard BIC mechanical pencil
1 standard PIC pen
2 rubber bands
1 drill with a drill bit the width of the pen
1 super glue or hot glue gun

Sorry I couldn't get a picture of the drill and the hot glue gun. I'm saying this because I am a very visual person and pictures help me very very much.

Step 2: Break Off the Front

Picture of Break Off the Front

Take the pencil and hold the bottom on a table and push against the top which is off of the table. The tip should crack of and the lead will pour out with the other parts of the pencil.

Step 3: Connect the Rubber Bands

Picture of Connect the Rubber Bands

Slit the eraser and slide the rubber band through it. Then use the other rubber band to keep the rubber band from sliding. Sounds a little confusing huh? ;) These pictures should help.

Step 4: Take Apart the Pen

Picture of Take Apart the Pen

Take apart every piece of the pen and lay them on your work table.

Step 5: Drill the Hole

Picture of Drill the Hole

Drill a hole in the pencil about the width of the pen. Pop the pen tube in and glue it in place.

Step 6: Place in the Automatic Feeder

Picture of Place in the Automatic Feeder

Now place the ink tube in the pen tube pen point first. Wrap a rubber band around the tip. This will push the ammo down the tube into the barrel. You're finished!


Dr J (author)2007-03-06

i made this with other pens so that airsoft BBs can fit into it but when i pull the inner barrel, several BBs entered the shooting barrel. how to make it so that only 1 BB can enter the shooter at a time?

disturbedreaper (author)Dr J2008-03-13

u have to move the ammo feed back so it is just in front of where u pull the inerbarel about the length of the bb. also try not to tilt it down hope this makes sense if not just let me know if it help ill try to check back l

Dr J (author)disturbedreaper2008-03-14

that makes the whole firing process rather slow, i mean especially when it's in so much control and all... the angles i can't point at; how much further back i must pull the inner barrel and that makes it pretty much unflexible doesn't it? i think there could be a way to modify the area where the BB drops in, just so there can only be 1 BB in the shooting barrel at a time... good idea? i dunno, lol.

biggyeyes (author)Dr J2008-05-30

i think there has to be some kind of shim inside that has a hole in it that fits on the wall that moves with the thing that you pull so that when you pull the trigger fast enough(or slow enough,) only one bb will get in because of the limited amount of time the hole in the shim will let a bb get inside the barrel. I'm gonna try make this with a shim... (next an automatic hehe.)

Dr J (author)biggyeyes2008-06-04

hmm.. it never occurred to me that i could modify part of the inner barrel, the addition of a shim is a pretty good idea.

Dr J (author)biggyeyes2008-09-20

easier drawn than made. for me, that is. i dont have any equipments to melt down plastics/heat em up for re-shaping guess what. i made my BB shooter entirely out of different kind of straws and paperclips and the rubber grip of pens, lol.

sheepborg (author)Dr J2009-12-10

i have made a spring loaded magazine that lays across the barrel with only the pen and the pencil and some spings from other pens.
it does however take a good bit of cur pieces which make it run less smoothly but it still functions
another thing i made was a removable and replacable magazine (more cutting) (author)sheepborg2012-08-29


Tzite (author)Dr J2009-09-10

Ive been building something super similar and ran into the same problem. I am workingon a solution and am making progress. If i figure it out I'll let you know.

Revan_Taros (author)Dr J2009-05-22

it could always become a shotgun style one so when it loads multiple bb's for a buck shot effect and end up hitting multiple

Revan_Taros (author)Revan_Taros2009-05-22


dla888 (author)2009-11-21

We did this kind of thing in Jr. High... The teachers began confiscating them. (author)dla8882012-08-28

we did it in 6th grade 7th was pe guns and im in 8th now

I Love Missy 11 (author)2007-04-28


yea just watch your hand i put a huge cut in my hand with a knife

dodo91 (author)random joe2009-02-25


sheepborg (author)dodo912009-12-10

oh come on, you have to be a noob to cut yourself
i have only ever used a knife to cut, no drill for me...

Braeburn (author)I Love Missy 112008-05-30


xZCodmaNZx (author)2009-03-15

to make it full auto try to hook it up to an airsoft gear-box.

Colonel88 (author)2008-05-07

Very nice 3rd picture. (Soryy, but your foot is creeping me out)

Deltablazing (author)Colonel882008-08-02

its not his foot...

Kaiven (author)2008-05-30

Dude... the comment is over a year old. I know how to do that now

Bobthewrecker (author)2007-06-17

What can I use if I don't have a drill bit that big?

You use a knife.

gameking7 (author)Bobthewrecker2007-07-05

wat do u mean if u don't have a drill bit dat big ur bob the builder for god sake, jk lol

Ganonman (author)gameking72008-01-19


Chimney-Taichou (author)2008-01-28

i put a nasty cut in my finger trying to do that. I tried drilling and i didn't get hurt. _

xHatakeX (author)2007-08-28

oh use some pointed tip scissors and keep turning it and u'll get a hole

xHatakeX (author)2007-08-28

I tried using small clay balls and they work great but they sting so dun blame me

pasteeater565 (author)2007-06-12

what if you added a rubber tube to the top of the feeder then connected one of those bb canisters with 2000 bbs in it

armorwaxer (author)2007-05-31

if u use an mach pencil ram shate sor the loarder on top and scrap themuzzle out a litte so it will be wider u can shoot bbs really far

Jakob_93 (author)2007-05-20

Nice, but it jams often or over loads releasing all the ammunition in the magazine. I made on with a sort of trigger and it is automatic or u can load in each round after fired. Instructible will be out soon!!!

adamthiede (author)2007-05-03

You should use 4.5 mm metal bbs to shoot. They fly farther and are more accurate.

Bad Donut (author)2007-05-01

You might be able to. I highly, highly recommend a drill though because it is WAY faster and more presice.

gunmanx (author)2007-04-07

its better if u use a pen so airsoft bbs can fit in the barrel

twitchy (author)2007-03-25

Finally something to bug my german teacher with

your mom (author)2007-03-19

i figured out that instead of a pen and the ink refil thing, you can use another mechanical pencil, it fits perfectly in itself and doesnt have the chance of the rubber band falling off if you do it right ;)

Pencil Archer (author)2007-03-09

Hey i need help how do you work the feed

street104 (author)2007-02-20

ok i know i sound atupid but i dont get how to fire it

Bad Donut (author)street1042007-02-22

Pull back on the eraser part and let go. If that doesn't work, you probably built it wrong.

street104 (author)Bad Donut2007-02-23

oh i see

street104 (author)street1042007-02-20


Kaiven (author)2007-01-04

how do you add as a favorite? im new...

Kaiven (author)2007-01-04

I made one... and it works! i loved this so much, i made a shotgun shell. make foil balls the same size as your BB. put three in the end of your gun, and fire. they come out and scatter.

natofyelsew (author)2006-11-11

i forgot to say thAT IF YOU DO NOT REPLACE THE BARREL, IT WILL NOT SHOOT THE AIR SOFT BB'S. also the bic barrel is harder to shatter. the plunger is more likely to break than the barrel☺☺☺

natofyelsew (author)2006-11-11

also, remove the ink cartridge and load up some airsoft BB's. put the cap of the bic pen on the end so you wont have bb's going everywhere when you shoot. oh remove the mechanical pencil and replace the barell with another bic pen

easycom (author)2006-11-10

im trying this thing

beam (author)2006-11-08

i love this. me and my cousins did a similar mod, except not as well executed

the davis clan (author)2006-10-02

bad idea... i got suspended in the 6th grade for this. with out the semi auto thing, take a inkcartrigde with the little spring on em take off the spring and shoot em, the stick in the ceiling. (defacing school property is what i got nailed for)

About This Instructable




More by Bad Donut:The Changing AceSuper Shinking Plastic!Make the Best Lemonade Ever (for one)
Add instructable to: