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Need Some Help With a Blow-Forward Semi

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: Mr.Sandman » Tue Aug 18, 2009 11:54 pm

jackssmirkingrevenge wrote:You can use the "poor man's chrono" to get a velocity estimate using airsoft BBs and cans.


Shame on you for using my homepage as a reference :D :lol:.The can needs to be coke though.
You know that if it shoots through both sides, thats only 340 fps, thats not that painful.
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Unread postAuthor: jackssmirkingrevenge » Tue Aug 18, 2009 11:57 pm

You ought to be proud :P :wink:
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Unread postAuthor: Mr.Sandman » Tue Aug 18, 2009 11:59 pm

jackssmirkingrevenge wrote:You ought to be proud :P :wink:

Now pcguy is gonna track me down and change my homepage to spudfiles. :lol: But back on topic, how far do you and your friends usualy play from each other?
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Unread postAuthor: noname » Wed Aug 19, 2009 12:09 am

Well, they weren't coke cans, and I did have them up against something so they couldn't move. I also don't have any .2 gram BBs, only crappy .12s.
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Unread postAuthor: Mr.Sandman » Wed Aug 19, 2009 12:12 am

noname wrote:Well, they weren't coke cans, and I did have them up against something so they couldn't move. I also don't have any .2 gram BBs, only crappy .12s.
Then you really need to read jacks link to see how extremely inaccurate you are on those readings.
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Unread postAuthor: noname » Wed Aug 19, 2009 12:22 am

I did, and it was slightly depressing. :?
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Unread postAuthor: django » Fri Aug 21, 2009 5:13 am

Interesting read this thread,Im looking at making another Semi Auto myself but in 6mm and using a better feeding set up than in my Pitbull 9 semi Auto .It cant take more than 120 psi and 9mm BB ammo is expensive so I'll go 6mm this time but still unsure what bb feeder to use?,blow forward looks to be pretty finicky/complicated?.

The 2 T- Fitting type feeders Jack provided links to= I would suspect they would at least double/tripple feed even with a tight tolerance mag tube!?. Again I'll be using a 1/4" QEV + Poppet Valve as per 9mm semi as it works well
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Unread postAuthor: jackssmirkingrevenge » Fri Aug 21, 2009 5:35 am

django wrote:The 2 T-Fitting type feeders Jack provided links to, I would suspect they would at least double/triple feed even with a tight tolerance mag tube.


Not if made well. That's the issue really.
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Unread postAuthor: noname » Sun Aug 30, 2009 10:00 pm

The gun is now about 90% done. Literally all I need to do is attach the barrel and magazine. It looks kinda funky right now but everything is hooked up and I can dry fire just fine. I have everything hose clamped, including the propane tank stock and the trigger handle set up. As soon as I slap the barrel and mag on, it will be finished. I don't think I'll paint it because I like how it looks the way it is right now. Pictures soon, hopefully.
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Unread postAuthor: THUNDERLORD » Sun Aug 30, 2009 10:34 pm

"Need Some Help With A Blo"

:lol:
Sounds like a personal problem. :P

EDIT: That was "rude" so anyway, since it's strictly "Semi",
And shoots airsoft BB's (which are little over 1/4").........

My thought, why not use a two stage trigger:
The trigger connected to the magazine OR magazine sleeve,
You pull it back, dropping in a shot and blocking the hole in barrel,
On fully pulled back, it closes a switch and vents the pilot electrically?

Still simple and nice trigger pull for airsoft size. 8)
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