SpudFiles

Looking into building a sniper for airsoft and had a few questions
1) how consistent are QEVs? any other style of valve that would be more consistent and still open fast enough? (.3~.4g bbs in a 630mm barrel)

2) curious as to what you guys think about this trigger setup:


it is meant to pilot the QEV

light blue area is from HPA, red area is to/from the QEV
light green stuff is neoprene
yellow is o-rings
the grey circles are a spring to counter the pressure

This wont work unless you use very low pressures. By the way its sniper rifle not sniper. But regardless unless you can find some incredibly strong spring then your valve will open at some random pressure like a popoff but I doubt you will know unless you measure the strength of the spring.

kk ty,

frohst wrote:6mm sniper

Wow!!! A mini figurine of a long range rifleman!
Hahahaha... Like sandman said... Sniper refers to the person. Sniper rifle refers to the gun... Just another common misconception...

Same thoughts as him as to the workings too.

why do you care so much about all that 'sniper' thing...
there are things called sniper rifles, you know...

but the word rifle does not fit most spudguns which have a smooth bore barrel... on the other hand, the word sniper spudgun is a bit too long... so that's where the process know as clipping takes place (which is quite common for english)
wikipedia article on clipping
and the term is reduced to just 'sniper'


so people use the word 'sniper' when they mean
sniper - (plural snipers) n. a spudgun which is to some extent more accurate than an average spudgun and/or has some features typical of accurate guns (such as a scope);snipers are typically of small calibre (barrel diam. >~ 1").

(lol you've got a definition)

deathbyDWV wrote:

frohst wrote:6mm sniper

Wow!!! A mini figurine of a long range rifleman!
Hahahaha... Like sandman said... Sniper refers to the person. Sniper rifle refers to the gun... Just another common misconception...

Same thoughts as him as to the workings too.

... or the bird...

So we should call sniper spudguns " snipey"

How bout that?

QEV's are very consistent of the pilot valve is big enough.
Anything bigger than a schrader will make it consistent.
For airsoft even a 1/8" QEV will do just fine.

But what if he doesn't rifle the barrel is it a sniper gun ?

In military and law enforcement terminology, a sniper rifle is a rifle used to ensure accurate placement of bullets at longer ranges than small arms. A typical sniper rifle is built for optimal levels of accuracy, fitted with a telescopic sight and chambered for a military centerfire cartridge....

quick wiki.
dont see it saying anywhere that it needs to be rifled.... (however that would improve accuracy which is a requirement(if this was mythbusters we would have to agree with plausible ))

If you air using HPA with a qev: One the Qev couldn't handle it it would have to be regulated and Two QEVs are very fast opening and powerful valves, shooting someone at anything over 30psi will easily break the skin and higher will easily penatrate flesh so be careful.

Technically the bird is a Snipe and the guy shooting the bird is a Sniper.
I'm not sure why people get all hung up on the technicality of the word.
Considering the origin of the word there is no correct term.
It is just what is accepted. Keep using the term sniper "incorrectly" and it will become accepted.
Originally a person hunting Snipe used a shotgun.
Get back to the convoluted origin of a term before you get all anal about it.

sniper , sniper rifle it doesn't really matter ... Personally I would consider anything built to be accurate over distance (most likely with scope and bipod ) to be a sniper rifle.

For what you’re looking at constructing a Qev would be perfect!! Especially running on HPA since you can reg your pressure down.

Even if you were to shoot at 400psi (insuring you had no leaks or other major changing factors) your rifle (can I use this term ) should be pretty consistent !

I shoot 6mm steel bearings at the moment @100psi , 12m at a coke can and very rarely will you miss , even my misses is a good shot with this

With your trigger setup there will most likely to much weight causing it to open , but there are plenty of really good ideas around depending on how you want to set it up (single shot, semi etc) let us know will be glad to help

POLAND_SPUD wrote:why do you care so much about all that 'sniper' thing...

I was just joking. In all seriousness... I don't care one bit. Well maybe a little but right now I was joking. Shoulda made that more clear using a...
JK
Iz better naow.

Oh BTW... I'd suggest a pushbutton valve for the trigger.

lol XD my god this forum is ALIVE!!! (most of the forums i have used take 1-2 weeks to get 3 replies ) ahm, lol at the whole sniper/ sniper rifle discussion, you guys are more anal than the squad i go with (they get hung up on mag/clip)

Yeah i was definately going to regulate the HPA down, needs to have a muzzle velocity below 550fps with .2gram bbs. Running GGDT though, it seems i would need to bring it down to like 40 psi or less . considering most gas airoft gas guns run off those coleman propane cans, which i thought were 100ish psi this seemed really wierd... (also people who rig an HPA system into the gun tended to use 100ish psi as well, but with airsoft the chamber is in the magazine which makes it a rather leaky process to get to the barrel)

Does 40psi sound about right? or am I just a failure with GGDT?

2nd I have another trigger system to ask opinions of

modded version of something iknowmy3tables posted somewhere, so if it works props to him. gas goes in the bottom middle hole, exits through the top to the pilot, when pulled the pilot should vent to the right hole, the left hole is so air can vent when pulled and spring is to close it up once pilot vents


@ deathbyDWV how much effort does a push button valve take to open? curious as to whether it would be feasible to have the top half of a rifle styled trigger push into it to open it...

sorry for the long read but thanks a bunch for all the help

I don’t think 40psi is going to do it for you dude, it will have to be at least 100psi. Most likely more.. The further the distance the higher the pressure will have to be..

Also is air wastage an issue?? Are you going to be carrying a HPA bottle with you?? Qev's can be very inefficient with air being wasted from the pilot + if you’re looking for semi auto or to have multiple shots out of one reservoir you will have to go to something like a hammer setup for your valve so you would have to take that in to consideration.

I don’t see why the 2nd valve wouldn’t work it would be heavy depending on your pressure and would also take a bit of fine tuning but I don’t see why it shouldn’t