Calling all GBB rifle owners - Please vote part 3
 

Thanks to all of you whom have voted so far in the other polls. I appreciate your feedback! :)


Here is part 3: Please see polling questions above.


Once you are done here, please see the following threads all other parts of the polll:

Part 1:http://www.airsoftcanada.com/showthread.php?t=132899

PArt 2: http://www.airsoftcanada.com/showthread.php?t=132915

Bump...Please vote on this one! :)

My WE G39 uses proprietary mags, allowing no other choices.

I could honestly care less about the rest of the options. I would just love to see a GBBR that you can take out of the box and reliably use consistantly without having to replace something.

If i'm paying 600 dollars for a gun, I expect it to hold up its end of the bargain and not need to replace cheaped out/high stress parts. My WE m14 for example was a massive fuckup out of the box. From a bent inner and outer barrel, stripped barrel nut, worn down hopup and fragile loading nozzle rails...

Yeah.

So far i've been using a KJW 1022 and KWA Mp7, not one single complaint yet.

aftermarket WE mags
 

What I would like to see made available are mags for the WE open bolt system that take CO2 and are refillable (avoiding the use of 12g cartridges). ProWin currently make such a mag for the WA system, but they do not unfortunately make such a mag for the WE system (either AWSS or open bolt).

I've also wondered if a conversion kit could be manufactured for the existing WE CO2 mags that would replace the 12g and retaining nut with a small reservoir and fill valve? I'd love to end my reliance on 12g powerlets!

What are they using to refill the mags with CO2, do you have a link?

ProWin CNC GBB M4 Magazine CO2 high pressure test - YouTube

If you are talking about this, they are only testing the magazine at higher pressure to show that it doesn't leak. The pressure in the magazine is a fraction that of the 12g cartridge, the rest is spewed out from the nozzle while filling it. It's a very poor way of leak testing a magazine. In the end you can see very little gas is in the magazine as he vents out the gas.

What would you fill them with?

a 12g powerlet and an adapter?

You can make one easilly with a bunch of old powerlets, a drill, a bench wise and a tap. Just need to install a fill valve from madbull (they are steel and withstand CO2 in HP grenades) at the end of the powerlet and drill a clearance hole in the large flat screw for it.

half assing a high pressure reservoir is never a good idea lol

X2 lol

I have an idea to prototype one, but I would use appropriate material as I don't think a 'recycled' 12g powerlet would safely withstand the repeated fill/empty cycles.

It is worth noting that my original question was based on an almost complete lack of knowledge of the material strength requirements involved. I would have to drag out some engineering texts from the attic and determine what material and wall thickness would be required to handle CO2 at 900 psi (I believe that's the partial pressure of the gas in a CO2 powerlet or tank).

Using 12g powerlets to fill the mag would defeat the purpose of adding a fixed reservoir. My thought was to fill mags using a paintball type CO2 tank with an appropriate fill adaptor (such as the needle adaptors used to fill grenades). Logistically this would be very similar to filling propane mags from a cylinder; the cylinder is generally considered too bulky to carry while playing. The benefit of using CO2 would be better performance in cold weather (an issue in this part of the world). I used to play paintball in the winter and found that while muzzle velocity decreased a little in cold weather, CO2 powered guns were still quite effective.

It is my understanding that the partial pressure of CO2 gas in a pressurized vessel has more to do with the temperature than the size of the container. CO2 will exist as a gas until a threshold pressure is reached at which point it will condense into liquid state. All CO2 tanks, be they of 12g or 20oz capacity will contain a mix of liquid and gaseous CO2 when full, with the partial pressure of the gas sitting somewhere around 900 psi at room temperature.

The only way the pressure in the magazine would be lower than that in the powerlet would be if the mag contained gas only. Filling with the powerlet inverted would let gravity drain the liquid CO2 into the mag. There would undoubtedly be a change in pressure due to the increased volume so some of the liquid would be expected to flash into a gaseous state. Leaving the powerlet and the mag connected for a finite period should ensure that the gas pressure inside both vessels is equalized, while the inverted orientation would ensure that any liquid CO2 would drain into the mag (gravity works). This is why green gas or propane magazines must be filled with the source container inverted.

Hence the test video does demonstrate that CO2 may be safely contained within the ProWin magazines, provided that the temperature does not become too extreme. I'm not sure if the ProWin mags contain a burst disk; I know containers greater than some threshold value (which I don't recall) must be fitted with a burst disk (as dictated by safety laws/regulations in North America).

For me the most important things are quality, price and realism.
They shouldn't leak or break down. Price should be low enough that buying multiple magazines won't cost you an arm and a leg (MAX $50). Obviously should be as real as possible.

Thanks to the admin who crapped all over my poll!

What is wrong with you people!?

Voted!