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Need some ideas/plans for a semi-auto portable bb-rifle

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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Unread postAuthor: SleekZ » Tue Dec 18, 2007 12:53 am

it's all good fellas; it's all part of what I'm asking anyway so no worries!

so s.man building a piston would be heaps better for performance etc. then a blowgun? it's it's heaps better I'll have a look at making one!
I'll also have to check out getting some brakeline soon; I don't really want to go in there and ask them if a bb fits in snugly tho! haha
bb guns are kinda illegal in Australia, so yeah!
thanks again
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Unread postAuthor: SleekZ » Thu Dec 20, 2007 6:12 am

I reckon I'll get most of the stuff for this tomorrow, but I'm just wondering what sort of system I should use to keep the bb sitting in the barrel without rolling out?- I reckon I'll either go with the breach-loading design or some sort of magazine, if that works better.
look forward to your ideas as I wanna get this thing going real soon!
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Unread postAuthor: Carlman » Thu Dec 20, 2007 6:22 am

on my 3mm bb gun (which i later discovered is actualy 1/8" lol) i cut a slit in the barrel at the start and inserted a o ring so it covered the top 1/6 of the barrel diameter, it gave me more power and the bb doesnt roll out.
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Unread postAuthor: SleekZ » Thu Dec 20, 2007 6:26 am

yeah cool, sounds simple enough :wink:
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Unread postAuthor: Carlman » Thu Dec 20, 2007 7:31 am

it is and the power jump is impressive too, do it, and it depends on how strong ur o ring is but to apoint the further it is in the more power it gets.
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Unread postAuthor: SleekZ » Fri Dec 21, 2007 12:51 am

well I had a look today at a couple of hardware stores at some aluminium tubing but the closest I could get was a bout 30% too big for a bb- is this the size aluminium you guys use, or is it tighter.
I'll still have a look at some brakeline when I ge a chance.
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 21, 2007 3:22 am

SleekZ wrote:well I had a look today at a couple of hardware stores at some aluminium tubing but the closest I could get was a bout 30% too big for a bb- is this the size aluminium you guys use, or is it tighter.


I had done a comparison test comparing a 4.5mm i/d barrel with a 5mm i/d barrel, for 4.5mm lead balls. That 0.5mm difference gave about 25% less power for the wider barrel, just to show you how important barrel tightness is.
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Unread postAuthor: SleekZ » Fri Dec 21, 2007 5:33 am

yeah I thought so; I did consider getting the tube I saw today, but I realised it would be worth waiting for some which is a much better fit, which would make this whole project actually worth going to the effort for!
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Unread postAuthor: ALIHISGREAT » Fri Dec 21, 2007 6:14 am

are you using bbs or airsoft bbs? because airsoft bbs should fit well inside 8mm aluminium tube because it has 1mm thick walls.
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Unread postAuthor: SleekZ » Fri Dec 21, 2007 8:06 am

ALIHISGREAT wrote:are you using bbs or airsoft bbs? because airsoft bbs should fit well inside 8mm aluminium tube because it has 1mm thick walls.

All I can tell you is that they're plastic and yellow...being in Australia, none of this stuff is exactly common/well known about because bb guns/airsoft is f@(%!#g illegal!
What I looked at must have been like 12mm then 'coz it wasn't even close to a tight fit.
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Unread postAuthor: Carlman » Fri Dec 21, 2007 8:56 am

where did you get airsoft bbs in OZ
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Unread postAuthor: SleekZ » Fri Dec 21, 2007 7:56 pm

bought some cheap sh!tty little spring powered bb gun from a toy shop like 3 years ago and it came with like a thousand or so of them; don't know where to get any more though...
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Unread postAuthor: Carlman » Fri Dec 21, 2007 11:24 pm

do any other ozzies know?
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Unread postAuthor: MrCrowley » Fri Dec 21, 2007 11:34 pm

Seems that a lot of Aussies can't find them and inprovise instead, but you can always get them of eBay or Trademe.co.nz
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Unread postAuthor: Carlman » Fri Dec 21, 2007 11:42 pm

yes but if i got say 2000bbs direct to my door, dont you think that coppas mite think i have an illegal and 'very dangerous' bb weapon??
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