How to Make My Pneumatic Gun




In this instructable i will show you how to make a gun that i have made from my own plans and have been modifying for a long time. This one is a small caliber (10 mm) high preasure (3-4 bar) type.

Bear in mind this is my first instructable but feel free to pick at the design and constructively comment;-)

i take no responsibility for any cats/humans you kill with this!

(i will upload a video of it being fired soon!)

most of the parts specified can be found at screwfix direct, but you may want to buy the preasure guage off ebay or somewhare like that because i payed about £25 for mine!
please rate & comment!

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Step 1: Firstly, How to Use Compression Fit Plumbing...

see the pictures

Step 2: Assembly Step One: Make the Barrel

firstly get your 10mm pipe and firmly attach it to the 15 to 10 mm adapter then attach about 5cm of 15mm pipe to the other end of the adapter. then attach this to the ball valve so that you pull the lever away from the end of the barrel to open.

Step 3: Assembly Step 2

attach about 8cm of 15mm pipe to the middle of the tee then add about 12cm on one of the sides and about 5-6cm on the other.

Step 4: Assembly Step 3, the Compression Chamber

(sorry that it was already assembled, i couldnt get the darn thing apart!)

Step 5: Put All the Main Bits Together!

add the compression tank to the bottom of the tee and the barrel to the largest pipe on the tee so that the handle faces UP.



Step 7: Attach the Preassure Guage

simply push it onto the open peice of pipe that is left as far as it will go.

Step 8: Pump It Up!

use a bike pump that has the quick release kind of valve to keep all the air in, pump it up to about 3 or 4 bar. (with the valve shut obviously!)

Step 9: Ready? Aim, FIRE!

shove the end of the barrel a couple of cms into a potato and push it down the 10mm part of the barrel and no further.
you may want to do this before pumping it up so you keep more of the air in.

make sure you pull the ball vave very quickly, and all the way (after aiming it at the neigbors cat!)

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    53 Discussions

    this is a vary good man but i think i may have a better one that will actually shoot arrows and be able to bring the arrow back to you with a fishing reel set u


    11 years ago on Introduction

    i wished i could make it !! but in america copper is expensive! i will ry to make one out of PVC instread! yu should try it itll be lighter! are you from the UK cause those are british bakery potatoes!?'

    7 replies

    Reply 11 years ago on Introduction

    lol! yep im in the uk, the reason i use copper is that i have lots of it, i didnt think of people who dont :-(


    Reply 10 years ago on Introduction

    copper will explode easier because of the fact that it is supposed to be used for water piping.... not be more worried about the copper

    the weakest type of copper (type m) is rated to 250 psi. that's 250 pounds of pressure per square cm, regardless of whether it's water or air. Since he's using a regular bike pump, it won't go over 100 ps1. the most serious injury you could get from a basic ball valve pneumatic like this would be from dropping it on your foot.

    niether is pvc id use threaded steel but i would be HEAVY but you probably wont get high enough pressure to make it explode even eith co2


    9 years ago on Introduction

    I wonder, what if you had a gravity fed magazine (after the valve). It would be easier to use bbs if you added one. Would it work?


    10 years ago on Introduction

    1. What air source should i use? 2. can i use a paintball co2 tank? 3. How can i fire 10mm, 7mm nails or whatever?

    1 reply
    blugyblugLED master22

    Reply 10 years ago on Introduction

    Yeah i know... I found out about half an hour after I posted that... And i still know 10 months late r 0.0


    nice bd (bearded dragon) how old is it iv posted to bd care sheets on this site

    Picture 012.jpg

    11 years ago on Introduction

    i know a funny dialog about pushfits plumber-we just cracked the pushfit boss-dont worry i have an extra plumber-then give it boss-are you joking plumber-(awkward silence) me all the time-heheheheheheheheheheheheehehehehehehahahahahahaha


    11 years ago on Introduction

    Wait nvm... Great gun though. But the dragon owns ur gun.


    11 years ago on Step 1

    i suggest u solder the olive on to the pipe