Gas operated automatic PB guns?

This puzzles me:

Why are there not mechanically operated paintball guns? Yeah, there's that response trigger thing, but that blows more gas then a fat man. Why doesn't any company just copy the design of a simple blow-back submachine gun? I mean it does kind of have a blow-back design already, but why not make the trigger mechanism the same? It'd be very easy. I personally modified my M98 so that the seer pin slips, however the rate of fire was so fast it couldn't chamber a round. This reminds me of when you're messing around with semi-auto rifles and push down the seer pin, but the hammer rides the bolt forward and doesn't strike the firering pin with enough force to set off the next round. However, if you were to get something to delay it by maybe a quarter second, it'd work. That delay could easily be made a la properly functioning trigger and seer. It'd be extremely easy, and I could do it myself if I had a machine shop.

Tippmann should definately look into this, it'd be extremely easy.

Also, I made this thing that bolts around the gun and has this crank kind of thing that the charging handle bumps into when it goes back and forth. A nut on it can vary the resistence, and when adjusted properly it delays it just enough so that it firers automatically.

http://www.pbreview.com/products/reviews/953/

I'm not talking about paintball feilds with those big inflatable things, I think that kind of stuff is dumb(no offense intended). I play in the woods and on the beach and stuff.

But illegal? 

Also, aren't there those paintball feilds called like "war games" or something, where they're set in the woods with bunkers and they don't care about velocity or automatic fire?

high velocity + automatic fire =lawsuits, bad points for out sport, and perhaps banning of personal markers.......funny how 1+1 can equil three......

"high velocity + automatic fire =lawsuits"

No, I believe 1000 fps is when it counts as a "fire arm". Besides, if you can fire it at people in semi-auto, automatic won't matter. And also, if that were true, what about the electronically operated automatic guns? I know it's not true automatic, but still.

It's probably a state or city thing for where you live.

But seriously, I think I remember reading that 1000fps is the cut off.

Mechical full auto is relatively complicated.  Mechanical SELECT FIRE capability is quite complicated.

Electro full auto and select fire is cheap and easy, which is why most electros have full auto capability.

There is a very limited market for full auto only guns - hence the F/A and SMG are both out of production.  There is a significant market for select fire guns - hence most electros have select fire.

The real issue is select fire.  As long as most fields prohibit full auto, very few people will buy a gun that cannot shoot semi.

And, BTW, not all fields prohibit full auto.  I have played both indoor and outdoor fields with no restrictions on modes whatsoever.  Velocity restriction, yes, but not modes.  And I can vouch for the psychological effect of an A-5 with stubby barrel shooting full auto in a confined space.   :)

ALSO!!!

Why are all semi-automatic paintball guns blow-back? Why isn't there a gas operated gun that has a piston to unlock the bolt and open up the breech for the next round? That'd be more gas effecient than a blow-back. Also, why are there holes in some of the paintball barrels? While it quiets it, the gas behind the ball is dispursed, and you loose alot of energy. Why is this?

How is that? I guess because of the lack of rifling.

So why not have a rifled barrel?

Hell, why not make smaller, bullet shaped paintballs that fire out of a rifled barrel?

Other then the fact that the market is already mass producing the .68 cal balls...