full auto QEV + relieve valve bullpup. with CO2 *UPDATE*

[Cosmic Muffin]

ok so this is my plan, ive bought a 1/2 in QEV, 8mm braided line and push to connect 1/2in fittings, and a pressure washer gun off ebay. ive also bought a soda stream bottle, rekos it has 3470psi in it. and if the co2 idea goes ahead ill have to buy the adapter off ebay as well. barrel is 12cm i think, whatever marble size is anyway as thats the ammo. The QEV will be piloted by the popoff which is going to be set to release at 175psi. and the braided line i got is rated for 175, so is that safe to use do you think? and with the co2? i know ill need to get a regulator.. or do i?

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planning to assemble it like so. im having trouble finding ideas for the loading mech, as its going to be full auto and with a hell of a firing rate. maybe detent or oring? i made a quick sketch of a magazine there.

so will it work without me loosing my arms and possibly face?
ta

[wyz2285]

well blow forward bolt it´s the most reliable reloading system, but if the ROF is too high it may not have enough time to react . With marbles you really don´t need a high ROF, unless you want a .50 machine gun

[Cosmic Muffin]

I dont want a high rate of fire really, it would be hard to design a proper feeding system, and I don't have many tools at my disposal. I'd have to adjust the pop off valve and flow from the washer gun to get it to the ROF I want. What do you think?

[wyz2285]

its going to be full auto and with a hell of a firing rate.

You should put a regulator on the sodastream bottle, set the pressure to about 300 psi, reduce the air flow form the washer gun or use a blowgun(should holds 300 psi). The pop off valve works at 175 psi is ok I think, but you would need a bigger chamber for the qev(marbles are heave) or you could use paintball, they are cheaper and safer

[Cosmic Muffin]

yeh i have been hunting for one, but i dont know which one ill need, and they are all damn expensive. and paintballs im pretty sure aren't available to the public here. i think you need a specific paintball license

[wyz2285]

So does here, but when you buy them online nobody cares

[jackssmirkingrevenge]

Simple tee magazineworked great for BBs for me, not so good with pellets though. For marbles, important you have a good spring.

The important thing is that the end of the mag where the BBs enter the barrel is as close to the BB diameter as possible.

[Crna Legija]

If you can, get some other ammo, i made my semi for marbles and they just suck you can find a barrel that fits them well(coz their inconstant) and they break easy. I don't even use it much now because the bloody marbles.

[Cosmic Muffin]

I think I'll make some sort of blow forward bolt. And get the ROF to about 5 shots per second? Ill investigate the tee idea first though. Cheers guys what ammo would ou suggest?

[jackssmirkingrevenge]

Can you get 3/8" slingshot ammo?

[jackssmirkingrevenge]

Can you get 3/8" slingshot ammo?

[Cosmic Muffin]

I'm sure I could if I shopped around, eBay would be the way to go I'm sure, I have no idea of knowing if Its going to be a snug fit in the barrel though

[daniel0663]

Have you checked your local gun store? they have those little packets of 3/8" steel balls which have a 75 count, for around $15-16 NZ in my local store.

Ebay, is cheaper to some extent...
http://www.ebay.com/itm/Slingshot-Ammo- ... 280wt_1395

[jazzman56]

You can get slingshot ammo in all states of AUS as listed buy this site.

http://www.outdoorswarehouse.com.au/pro ... 9.5mm.html

[Cosmic Muffin]

Cheers guys just realized the washer handle I got has the wrong thread size! So bummed! Now I'll have to modify the thread -.-