Polar Star PR-15

[SteevoLS]

^ This

[Skywalker]

naw they make 13cubic inch hpa tanks that are really just slightly wider and longer than a buffer tube. and i know that you can get plenty of shots.... you aren't running the tank a 3000psi thats just what it holds. the actual pressure at the nozzle is more like 200psi

[dftrent12]

when the tank is full it is at 3000psi. And the pressure at the nozzle may be at 200psi but only with a regulator. That and a 13 cubic inch is extreamly small even more so if the tank is at the 200psi you said. I don't know about you but when the pressure gauge on my tank is reading 200psi I'm on my way to refill it. check out this equation (Tank Capacity) x (Tank Pressure/100) = Shots. So 13x200/100= 26 shots you would have to carry three times as many air tanks as mags. Not practical if you ask me when you can just use an external rig.

[Skywalker]

you need a regulator. its part of the external rig set up. you can't operate the gun without one. ... actually.... the fancy P* is probably regulating itself inside the GB, or whatever you want to call their "gearbox" sized piece of the gun. either way the tank stays at 3000psi. but 3000psi would be way way way too fast, and would probably break any airsoft bb inside the barrel

that is a makeshift formula, because it isn't taking into account how much volume of air you use per shot. and if it was from the paintball world, its going to be way off. you get like 8 airsoft shots to every paintball shot or something, at the same FPS that is.

[Skywalker]

also, just browsing forums, paintballers are saying they get 120ish shots out of a 13cu hpa tank

[dftrent12]

My point is that all hpa tanks have a makeshift regulator so the pressure would be lower at the nozzel. The way they work is that the tank lowers the pressure to a point that a paintball marker's regulator can handle. At that point the marker's regulator makes the pressure that is needed for that specific marker. As for the equation that one is made for the pr-15. That and as I said before the amount of aluminum to hold that kind of pressure would fill the buffer tube. A tank with a much lower pressure may work but still your shots would be very limited. As for the 13 ci tank, I'm seeing about 80 shots from it (with a paintball marker) and it is a bit larger than a buffer tube (to the point that the buffer tube would be very large and clunky). And on top of all of this, You would want a good number of shots out of a tank because it can be hard to find someone to fill it. While you can fill the tank your self it would be a pain to do it two or three times a day. So even if you could get a few hundred shots from a 13 ci tank, the cost to have someone do it for you could get really expensive as they charge by pressure, not by size. The same is true with filling it yourself because refilling a scuba tank is not cheap. So the bottom line is this, an external rig is not that big of a hassle as long as you have some sort of bag. That and an external rig is WAY more practical than trying to have an internal gas system that would throw the weight distribution off and over all it would really be more trouble than its worth.

[SteevoLS]

With all due respect, Skywalker, you don't have the foggiest clue of an idea what you're talking about.

The PolarStar uses *at least* a single external regulator. Trent was absolutely correct when he said a buffertube-sized HPA tank would not hold nearly enough compressed air to get the job done. The formula that Trent mentioned is the official, albeit conservative, formula released by P*.

(Tank Capacity) x (Tank Pressure/100) = Shots

88ci / 4500psi tank would be 88 x 45 = 3960 shots at 110psi (400fps w/ .2g in a CQBR).
13ci / 3000psi tank would be 13 x 30 = 390 shots at 110psi (400fps w/ .2g in a CQBR).

For the average player, you'd spend an awfully long time "reloading" your gun.

[Skywalker]

Lol i'll defend myself later when i'm on mi laptop. Too much typing

[dftrent12]

Thank you, Steevo.

[Skywalker]

Haha Trent I wasn't trying to just bash heads with you; although it kind of looks like that

[dftrent12]

Ya we wen't. I wish there were a way to have an internal gas system because the regulator is almost another 200 bucks.

[UF_Jester]

I've seen some good stuff about these on the NC forum. Also, I believe Mad Max will be using/raffling one at Irene this year so they're definitely starting to get out there. We should be seeing some reviews shortly.

[SteevoLS]

Anyone who wants to see one at Fulda should just track down Matthews on SWC. I'm sure he'll be using his. (PolarStar dropin in a VFC receiver, but not the PolarStar OEM)

[dftrent12]

Almost the same thing though. Don't the p* use a vfc body?

[UF_Jester]

Almost the same thing though. Don't the p* use a vfc body?

Yes they do.