full auto

[jackssmirkingrevenge]

read through the bloody topic *then* ask questions

[colty-bear]

well thanks guys most my guns are ghetto cause i have a very small hardware store lol.
but i am actually going to buy a cheap m4 style airsoft gun open it out take out internals sand it out and put this in


by the way i got my pump to my coaxial and i filled it to 350psi shot and the piston stuck and sealing face came off what kind of glue can i use to put rubber to jb weld?

[mark.f]

Well, I'm no adhesives expert, but judging by the materials you've listed...

JB Weld.

EDIT: a small wood or plastics screw through the sealing face into the piston will do much better than adhesives alone.

[colty-bear]

thanks mark f now back to the topic

[psycix]

Psycix: How much of the faster cycling (in the video) is due to the higher pressure in the HPA tank versus the fridge compressor, and how much is due to the much higher flow rate of the HPA tank? It's the high flow rate that actually gives the higher cycle rate isn't it?

Yes, it doesnt matter whether you feed it with 20 or 200 bar, it works on 8 bar at all times. 30 bar is nothing more then the maximum pressure I have readily available.
I can also fire it quite rapidly from the reservoir of my air compressor, but since it stops cycling at 8 bar, the 10bar, 25 liter reservoir gives significantly less shots then the 30 bar, 10 liter one.

I do not use an HPA tank, I use a fire extinguisher as air tank, which I fill using the fridge compressor, allowing for much more flow output, but both put out 30 bar at max.

So the faster firing rate is due to the higher flow rate. Of course higher pressure helps increasing flow.

[Brian the brain]

Too busy right now but I've still got that 19 bar pop-off waiting on you Psy.


More relevant to this topic perhaps, A modded 1/2" QEV ( accepting chamberside pressurisation) actuates beautifully by means of a pop-off.

Psy's vid shows a 1/4" qev, but this idea could very easily be taken to a larger scale.
Of course a larger valve would also perform the auto-feat, if it where piloted by the smaller QEV.
The modded QEV set-up could be used to optimise ergonomics.

[colty-bear]

ok now i need advice on ammo feed as i said it will be in an m4 style gun the mag comes up from bottom so i can hide the mag in a hollowed m4 mag then it will work but i have a question

what would work best for this
i want 1 bullet per air burst
no dryfire
no shooting 2 bullets at once
no jams

any ideas?

[ramses]

http://www.spudfiles.com/forums/gb-semi-t7899.html

If the projectile will be an airsoft bb, combine the two.
http://www.spudfiles.com/forums/bbmg-ai ... 16151.html

The dimensions of a standard airsoft nozzle (part that will go into the hopup) are as follows:

at the tip, It is 9/32 of an inch
then, 7/16 of an inch from the front it expands outwards to 19/64 of an inch.

the last 7/64" of the nozzle is the piece that the tappet plate rests on. I wont get dimensions, because it seems like your going to do something else than mount it in an airsoft gun.

Only other thing is the ID of the nozzle I have here is 7/32".

Also, It should be known Im 99% sure you don't need the taper at the back for it to work, but leave it in just in case. That and at the tip of almost all nozzles there are little nubs that prevent the BB from getting stuck in the nozzle. try it without them first, but im pretty sure your going to need those.

[colty-bear]

i think i will go with a spring plunger and a blow forward bolt

but i need help on a blow forward bolt is there any size pipe that fits in 6.03? how does the air push it if the air could just pass through the bolt?
what size pipe do i house it in?