Spring powered BB Gun

This is a project i am currently working on - spring powered BB/Dart gun. Requires Spring, Metal/PVC pipe (Whichever you feel more secure with, i chose metal), Metal barrel, I chose 4.5mm .77 barrel from an old airgun, spring, some cutting of wood, and dowwel. This is alot more powerful than other bb guns powered by combustion, bike pumps ect. so be carefull.

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Step 1: Materials

Airgun Spring - Check your local airgun shop, or if your australian, find one.

Wooden circles, cut with a hole saw

Metal tubing, to fit your spring.

Endcap for the tubing

4.5mm copper, or any other metal tubing for barrel, 4.5mm is .177 for metal bb's or airgun darts, although if you wanted to fire plastic bb's you will need 6mm tubing i think.

Metal dowwel

I think thats it *thinking face*

bigman123 says: Apr 27, 2011. 2:40 PM

cool gun ! where is the triger

sabladask says: Mar 2, 2011. 7:03 AM

Good! see my instructable i made a springpowerd piston airgun.

Surefire123 says: Nov 28, 2010. 10:17 PM

Sorry Scoblania but momentum is not force x time that's impulse which is the change in momentum over time. Momentum is Mass x Velocity. So you need to increase the impulse of the ammo.

scoblaina says: Oct 27, 2009. 10:59 PM

i really do like this design, and currently using three really strong springs 9cm by 3.5 (bought in bunnings, yes im aussie) and so yeah its pretty big, but while it has immense power, shoots really badly (using thick nails cut in half and so are about 3.5 cm long, they should be solid enough yet aerodynamic enough so i dont think its the ammo) anyway i think the trouble is that its not providing enough momentum, as the steel rod only pushes the nail about 15cm, before the nail relies on its own momentum. Because change in momentum=force x change in time, i think that the rod should push the nail for a lot alot longer (maybe even 50 cm), so is in contact with nail for longer, but this means a lot more springs which means the whole thing has to be bigger (think of how far you pull back a slingshot), so i recomend if having a fairly big powerful design make sure the rod is long, i will keep working on this and let you know what happens

Evidenceremoved in reply to scoblainaJan 22, 2010. 1:05 PM

Go Australia! Go Bunnings!

guitarwizard94 says: Dec 3, 2009. 7:45 PM

Has anyone actually made this? If not I have a few ideas obviously majority credit going to Camster911 but I'll think of a design!!!! Using a BIC Pen and a BIC Lighter!

scoblaina says: Nov 6, 2009. 1:02 AM

yeah it should be pretty good and il work on the ammo problem. il probs have it finished in about 3-5 weeks when i have more time and il keep this page posted when im done with links n stuff, it should be pretty big though

owen95 says: Nov 3, 2009. 1:59 AM

thats cool cant wait to try it. but first up scoblaina the nail is not the right sorta ammo to be shooting , a pellet or bb is much smaller and lighterand a bb ofers better acuresy then a nail "out of a smooth bore"

but yeah i cant wait to try it hope u dont mind me tryin to modify ur disign to go in a stock with a trigger.

JACK_MAN64 says: Sep 28, 2009. 3:27 AM

hey umm yer im with smily face im an ausse so how the hell do i find one like were do i go to get one your great ps i did it and its awsome but it took me about like three months to get a spring that was good

Rikufan12345 says: Jul 10, 2009. 4:19 PM

i made the gun and it sucked, the bb only shoots like five yards . . . . . . . . . . . idk maybe it's the spring?

Camster911 (author) says: Aug 29, 2006. 10:23 AM

By The way, in all this pictures the gun is upside down to show you how to mkae it, the screw should be under it. You pull it back, twist to the side, and aim, and press with your finger sideways to fire. :)

liquid008 in reply to Camster911May 14, 2007. 8:11 PM

how do you make the gun hold the BB in place when you cork the gun before shooting? Because I am making a bb gun out of a toy gun as it has the basic shape. There will be a lot work to do. In Singapore any form of bb guns is illegal and will be charged in court for owning a fire arm.

Madrias357 in reply to liquid008Jul 10, 2009. 9:49 AM

Agreed. In America, we can build our own guns. I couldn't imagine not having at least some sort of BB gun laying around the house. I have 2 custom ones (one's broken, the other half-finished), several hand-made rubber band guns (a dual-shot rifle, a simple pistol (instructable on it), and a bigger one designed to shoot high-power rubber bands.), and other assorted weapons, including a few airsoft guns, and some of my projects.

James (pseudo-geek) in reply to liquid008Jul 19, 2007. 3:21 PM

my word, its illegal to have a BB gun? that would make it illegal to have a firearm?!?!?! wow......pls come to america and we can shoot some stuff together.....

mynameishamm says: Jun 19, 2009. 9:54 AM

Thanks

.Jimb0. says: May 7, 2008. 11:29 PM

kenny1678 - you should be able to find all this stuff at bunnings

fork me3 in reply to .Jimb0.Jan 30, 2009. 9:23 PM

as for the spring go to colli hardware... i found crap loads of springs there. but going to toys are us and buyin a nerf nitefinder and then converting into a bb gun is heaps easier.... and saves time and money.