Which would be better?

[Goats spudz]

EDITED POST SO I DIDNT HAVE TO POST AGAINSemi auto or full auto? i have access to slide checks but i cant find popoffs anywhere just wondering

[PVC Arsenal 17]

That slide valve looks to be for paintball remote lines so in that case, probably not.

The ones I've seen look more like this:

[mattyzip77]

I would say no!

[Lockednloaded]

I've used paintball slide checks to make semi auto guns, I don't see why this wouldn't work with proper adaptors

[POLAND_SPUD]

it will work (provided it's a slide check valve)
The real issue here is would it be possible to build an efficient semiauto out of it

do you know how it is mounted (which side is vented )?
Do you have it or are you considering getting it ?

[PVC Arsenal 17]

it will work (provided it's a slide check valve

Though it's likely, we can't always go by a picture. Some sleeve valves only function as on/off valves. But again, since it's for paintball, it most likely vents in the off position.

With adapters it should work, sure, but then you'd be better off getting one with threaded connections so you can make the adaptation easier.

[Goats spudz]

Would this be good? or am i better with a popoff valve for full auto
http://www.ebay.co.uk/itm/120676803726? ... 500wt_1054 well is this a good valve for semi auto