Step 4: Step Three

Now, put a holesaw on your drill with 4mm drill bit in and whatever holesaw bit you need to fit your spring tube, it has to be able to move in there, if need be file it down a bit if you dont have the right drill bit.

Then, throught the hole in the middle, glue the 4mm dowweling in.
Screw a screw in the top of your circle, the slide the screw down your cutting in the springtube, therefore compressing the spring, and then twist to the side, locking in place, this is how you cock your gun.
Put this in your spring tube.
Where is the trigger?<br/><br/>How big does the spring have to be
<p>it has no trigger you just pull back and let go............</p>
cool gun ! where is the triger
Good! see my instructable i made a springpowerd piston airgun.
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.
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<br />
Go Australia! Go Bunnings!<br />
Has anyone actually made this?&nbsp;If not I have a few ideas obviously&nbsp;majority credit going to Camster911 but I'll think of a design!!!! Using a BIC Pen and a BIC&nbsp;Lighter!
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<br />
thats cool cant wait to try it.&nbsp;&nbsp;&nbsp; but first up <a class="entryListTitle" href="http://www.instructables.com/member/scoblaina/" style="padding-right: 4.0px;padding-left: 4.0px;"><strong><font size="3">scoblaina</font></strong></a>&nbsp;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 &quot;out of a smooth bore&quot; <br /> <br /> 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.
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
i made the gun and it sucked, the bb only shoots like five yards . . . . . . . . . . . idk maybe it's the spring?
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. :)
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.
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.
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.....
kenny1678 - you should be able to find all this stuff at bunnings
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.
lolz thats what im doing
where do you get the spring?
Any airsoft site except air splat , they suck or your local hard wear store P.S Im 11
im 10
Hmm if your australian find one lol thats helpful well good luck to me
just finished making one of these
i made one of those on my youtube here's the vid<br/><br/><a rel="nofollow" href="http://www.youtube.com/watch?v=tmzj2YwpT9M">http://www.youtube.com/watch?v=tmzj2YwpT9M</a><br/>
Haha! "Airgun Spring - Check your local airgun shop, or if your australian, find one." So true...
great idea! i would like to see a photograph of the finished product though
if i get some more money than ill make one THX BRO
oh, and if you make bb's from solder they will explode
oh, cool, how'd you do that???
<br/>check this site out<a rel="nofollow" href="http://members.aol.com/illinewek/faqs/casting.htm">link</a><br/>
ohhh... cool. not my thing though... i don't like messing with molten lead, unless for soldering...
use solder instead of lead
solder has lead in it... anyways, i don't feel like wasting my time casting when i can just buy normal ones...
ive got that sort of mechanism in 1 of my old dart guns so ime converting it into a bb gun
i have been designing a trigger mechanism, using a lever to release the spring, and it also has a safety catch.
if you want a more powerful spring you should get one from a hardware store
I'm going to make one of these out of PVC pipe.
i've made a little thing from a pen and some sort of things i got by scool i've think you can shoot bb's with it ps english isn't my first language
got a better idea but it's going to take a lot of patience to even describe let alone build it.
same, i have an idea using a bike pump and a spring and a lot of soldering
i dont really understand this instructable i am only 13 tho lol.... this is what annoys me right. i like in Australia and like nothing is legal over here you need a gun license to buy a slingshot ffs, and i dont know anyone who has a gun license. if anyone has any tips for me on where to get these sort of things please tell me!!!
you know i live in aus and im 15 and i have bout 4 different guns have a look <a rel="nofollow" href="http://aaron.com.net.sc/My%20Inventions.html">http://aaron.com.net.sc/My%20Inventions.html</a> i am also working on another h.e.r rifle <br/>
hey u know what kenny? here's a site to a powerful gun, abit expensive tho but fires at 500fps <br/><br/>this isn't my gun but have a go at it... probably cost u baout $40-$70 to make <br/><strong>co2 gun </strong><br/><a rel="nofollow" href="http://www.rotteneggs.com/r3/show/se/233092.html">http://www.rotteneggs.com/r3/show/se/233092.html</a><br/><strong>airhorn gun </strong><br/><a rel="nofollow" href="http://www.rotteneggs.com/r3/show/se/192128.html">http://www.rotteneggs.com/r3/show/se/192128.html</a><br/><strong>bb cap gun</strong><br/><a rel="nofollow" href="http://www.rotteneggs.com/r3/show/se/171435.html">http://www.rotteneggs.com/r3/show/se/171435.html</a><br/><br/>or if u want to be cheap buy like a nerf gun / X-stream gun / tek series... the ones thatshoots foam darts... just fit a tube the size of a bb and put tape around the barrel so it fits the tube properly, there should be a instructable about it some where on this site<br/>
ok i get allthe cocking andstuff but now where is the trigr to un cock and shoot ???? just asinif u got an answer show withdiagram thanks
I donot get it !!!!!! PLEASE HELP!!!!!!!!!!!!!!
I think it's cool. I've got one question though how does that make it spring cocked.
if u make it airtight and make sure the bb doesnt go down farther than the barrle u dont need a ram rod and that way ill be faster (less friction)

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Bio: Known for my crazy ideas, i like to build improvised weaponry, have been arrested many times for possesing this in public places/ firing. Check out ... More »
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