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o-ring detent for BBMG

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: JDP12 » Fri Dec 24, 2010 12:40 am

well I'll be using .177 BBs, and was thinking of using a rubber washer with .125" hole. I think that should be sufficient, if not I can step it up.

I plan on housing in a coupling of some sort so I can adjust it if necessary, but I want quite a high pop-off pressure.
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 24, 2010 12:42 am

JDP12 wrote:I plan on housing in a coupling of some sort so I can adjust it if necessary


In that case you should be fine, how thick is the gasket material you have?
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Unread postAuthor: JDP12 » Fri Dec 24, 2010 12:45 am

Have a couple thicknesses, I believe I have 1/16" and 1/8" available. Haven't decided which one to go with yet though.

Thinking 1/8", whats your opinion?
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 24, 2010 1:33 am

I would go with the 1/16", you're holding the BB in a smaller area meaning there's less chance of two BBs getting stuck in the seal.

This is a problem with detent mechanisms in that a BB could be left stationary in the barrel and be struck by the next shot, at best giving you inconsistent performance and at worst ruining your barrel.
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Unread postAuthor: JDP12 » Fri Dec 24, 2010 10:59 am

Hm....interesting, didn't even think of that. Crap. Well my barrel is brass sleeved in steel, so i don't know if barrel deformation will happen.. since the OD of the brass matches the ID of the steel almost perfectly.

We'll have to see what happens.

Would you put the detent after about an inch or two of barrel? seems like the logical place to put it, that way the BB's go into it straight
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Unread postAuthor: jackssmirkingrevenge » Fri Dec 24, 2010 12:11 pm

mech xmas

cokc
\bakks

yes,
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Unread postAuthor: JDP12 » Fri Dec 24, 2010 1:01 pm

Alright then......
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Unread postAuthor: JDP12 » Wed Dec 29, 2010 7:30 pm

Sorry to double post...but I have the detent all glued up and curing... so if I can get the actual gun workin tomorrow I should have some test results up tomorrow
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Unread postAuthor: Gaderelguitarist » Wed Dec 29, 2010 8:10 pm

mech xmas

cokc
\bakks

yes,


Looks like someone had a little Xmas celebration...

Is there any blow-by in your barrel with the bbs? Having an inch or two of barrel material before the detent that is tight fitting with your ammo would cause some kind of jamming double feed thing.
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Unread postAuthor: JDP12 » Wed Dec 29, 2010 8:17 pm

yea, there's some blowby in the barrel.
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