SpudFiles

I am looking for a qev that is either 1" or 3/4" for a shotgun I want to make. I looked on mcmaster but their qevs are only rated to 125psi I wanted more like 300psi I may have to make a piston for it.

and for a shotgun a 24" 1" diameter chamber and a 24" 3/4" barrel should be good right? does anyone know the approximate length of an average shotgun? a 3/4" barrel wold be about a 10 guage.
I want to make this as realistic as possible.

How about a 1.5 inch qev made from aluminum?
I could sell you the one i have.

Dont worry about those pressure ratings, its metal it should do fine, but i wouldnt guarantee the diaphragm being ok under those conditions.

Uk QEV's have been used up to 800psi, and 400psi regularly. 300psi will be fine.

Yup, i've used American ones at 300psi, they're fine.

pat123 wrote:......and for a shotgun a 24" 1" diameter chamber and a 24" 3/4" barrel should be good right? does anyone know the approximate length of an average shotgun? a 3/4" barrel wold be about a 10 guage.
I want to make this as realistic as possible.

The shortest legal barrel length for a smoothbore shotgun in US is 18"
For sporting purposes that would be considered very short.
(Shortest rifle barrel w/out being a pistol is 16")

3/4" is more like 12 ga. (about .725 ID).
Gauge actually refers to the weight of a round ball that diameter.
For example a 16 gauge solid shot or standard load of shot would weigh 1 ounce (16 ounces in a pound)
That's why the smaller the gauge the larger the bore diameter.
It's an old method of caliber definition.
IMO 24" is still short for a shotgun and very short for air powered.

BTW I often load shot type stuff in a 1"x30" and it spreads so much at close range one time I shot at a can almost point blank w/ half the barrel full and none hit the soda can (devine intervention?).
Also, I am wary of rock shot in pvc because they can sand the barrel. 8)

you can make somekind of a chocke..
go to a milling shop and set it in a lathe and fold the front end of the barrel a tiny bit inwards.