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Building a bolt action rifle, need a little help

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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Building a bolt action rifle, need a little help

Unread postAuthor: devilman » Tue Jan 22, 2008 6:33 am

Edited-

I have done the final plan for my rifle. All i need to do now is figure out how a piston valve works. Any help is appericated
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Last edited by devilman on Wed Jan 23, 2008 6:42 am, edited 1 time in total.

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Unread postAuthor: jackssmirkingrevenge » Tue Jan 22, 2008 6:41 am

A coke bottle can take 100 psi easily, go for it ;) as long as your connections are sound.
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Unread postAuthor: devilman » Tue Jan 22, 2008 6:51 am

Wen i can get my hands on a pump ill try the higer psi in the m16 style gun, see how it goes, cheers

Still trying to figure out the rifle
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Last edited by devilman on Tue Jan 22, 2008 7:08 am, edited 1 time in total.

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Unread postAuthor: Carlman » Tue Jan 22, 2008 6:57 am

i used a blow gun attached directly to a compressor and then attached it to a carbon fiber tent pole a bout 30cm long and it could get through 5 cans in a row at 70psi...

110psi takes chunks out of my concrete wall and goes through my shed lol

It is breech loading and has a hop up.

I too am in oz, where bouts u at?
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Unread postAuthor: devilman » Tue Jan 22, 2008 7:07 am

Hey champ im near brisbane.

I dont have a compresser yet, thats why i used a coke bottle to hold compressed air in. What do you use as ammo? im useing bb's that i pulled out of the crank of a bike, the problem is the tube im useing is bigger then the bb, even the smallest copper and metal tubes i have found have been a little to big, so the bb just rolls around the barrel.

Did a little more searching and this is pretty much excatly what, because of the psi that it can hold. Is anyone able to link me of a way to make something like this?
http://spudshot.com/Forum/viewtopic.php ... d9ae3fd2c6
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Unread postAuthor: Carlman » Tue Jan 22, 2008 7:12 am

yea im in perth mate, nice to meet ya.

Bunnings sells compressors made by GMC for 100$ and there brill aye. I use 3/8" bbs (crankcase bbs from a bike) you just go to the bike shop and get 100 for 5$ :D , my barrel is off a collapsable tent pole (fits perfect)

heres the link http://www.spudfiles.com/forums/1-8-bb-bg-t12270.html
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Unread postAuthor: devilman » Tue Jan 22, 2008 7:29 am

Checked out your gun and its basically the same as mine, cept mine is muzzle loading and inside a toy m16. Got the missus camra so i got some pics. Also i got a pic of the size bb's i shoot

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Unread postAuthor: Carlman » Tue Jan 22, 2008 7:51 am

yea did you see the milo tin damage :D

i have done a couple of shots at 100psi with the whole tent pole (3m) and im scared (went through 15 cans, through the 10mm plywood 'backstop' and rebounded and left a nice purple welt on ma arm) so i went back to 30cm for norm and 1m ish for sniping
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Unread postAuthor: devilman » Tue Jan 22, 2008 8:06 am

Currently im looknig at a 1m long barrel. The biggest problem i have is what valve should i use? Im looking at an all metal construction, and about 300 psi held in a steel chamber. Hell the bearings i use are abotu double the size of what you are useing, so im thinking of the damage one of them could do at 300psi with a longer barrel also?

I also gotta figure out all the sizes of the chamber, connecters etc etc, and i havent been able to find alot of info on that sort of thing.
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Unread postAuthor: Carlman » Tue Jan 22, 2008 8:16 am

best bet is with steel in Australia. Go to your local Bunnings and look near the pvc pipe and they have a lot of steel pipe pre threaded steel pipe of various sizes as well as fittings.

300psi excludes the use of a sprinkler valve and a qev (mostly, except if you like going over recommendations of maximum pressure) so maybe a piston valve, pressure washer handle or a ball valve is maybe all you can use.
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Unread postAuthor: sinper2006 » Tue Jan 22, 2008 8:18 am

hey they have 1m long aluminum tube at mitre 10 mega the smallest is 8mm id heres my gun http://www.spudfiles.com/forums/my-firs ... 12740.html i'm goin to upgrade to piston vlave soon hopfully i can shoot 15 cans lol woops stuffed up link
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Unread postAuthor: devilman » Tue Jan 22, 2008 5:39 pm

hey im just wondering if anyone has tryed this as a vavle, i found it while browsing for a compressor

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Im also redoing the plans for the rifle, the problem i have is the trigger is behind the ball valve. Is there a way i can make a spring loaded ball valve with th e trigger behind the chamber and ball vavle? Here is a quick plan i did

The right angel copper is mounted inside of the stock, with the lever of the ball valve ou tthe side. Can someone please do a quick sketch of how i coudl make it work? I woudl prefer to do a spring ball valve because its easyer then a piston valve. Thanks

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Unread postAuthor: jackssmirkingrevenge » Tue Jan 22, 2008 10:46 pm

Forget the air hammer, get yourself a cheapo nailgun from eBay, with some slight mods it will make an excellent semi-auto valve - or a coin launcher yay! :D
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Unread postAuthor: devilman » Wed Jan 23, 2008 6:51 am

Well i have decided on the final design after a little insperation. Here is a simple paint plan. the size's are 3/4 " and 1/4", with 6mm barrel. I plan on useing a piston valve as i wish to pump this thing up to 300psi or so. I will be drilling a small part out of the barrel so metal BB's can be loaded in, with a slider above it to seal the hole when its fired.

The main issue is how to make a piston valve. I looked at the one in the how-tos but it didnt really make much sence to me?

Here is the plan. The way its designed is the back of the pressure chamber doubled for a sholder rest thingy. I did a quick build in the hardware store, just to see how it would work, and its quick comfortable to hold.

Edit- Cost to build will be 89$ AUD minus scope. How does that compare to other rifles in price?

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