42 replies to this topic

[andrew01]

Here are some pics of my newly modded AT3K. If some of you read my xmas topic, i didnt just get this gun and mod it, it was an early xmas present. Anyway... I brass barreled the gun, and extended the air tank. I did this by draining the goo tube, then sawing the top bit off and sticking a piece of pvc on it. I have not yet tested this, becasue it is raining and the glue has to dry for 24 hours. Please give any feedback you have.

Here are the pics....

[Ice Nine]

It seems that it would take a lot of pumps to fill the air tank. And if that was the case, then the barrels are too short.

[Alexthebeast]

What size brass did you used?

[ShortShit]

yeah, looks like you near quadroopled the air chamber, which means there will be more air supply, but not necessarily more pressure... I guess we'll have to see how it worksout for you! As the SM1500 shows us (small air chamber--good range), a bigger air chamber doesnt always mean good range, just more pumps to reach the same range you'd had before. Can't wait to see your results.

Edited by ShortShit, 25 December 2003 - 01:47 PM.

[Cankywanky]

if you cut that pipe on top down a bit and stick a 90' elbow on it facing the back you could create a stock with some more piping.

[andrew01]

The brass is 9/16.

And yes I did think about extending the pvc to make a stock, but I guess I just forgot.

[THIRST]

Well, your either going to get the same results and need to pump more, or get worse results.

[NinjaBob]

Well, you might want to replay that pump with a larger one to compensate. I think you have a good idea, but I think you went over bored with the size. Also, one of your barrels is bent.

Edited by NinjaBob, 25 December 2003 - 06:36 PM.

[andrew01]

Well, your either going to get the same results and need to pump more, or get worse results.

Why cant I get better results. Why does it always have to be worse. It could be better. this morning I tested how many pumps it took to fill up the tank and it took about 6.

Edited by superintendent, 25 December 2003 - 06:50 PM.

[NinjaBob]

Well, your either going to get the same results and need to pump more, or get worse results.

Why cant I get better results. Why does it always have to be worse. It could be better. this morning I tested how many pumps it took to fill up the tank and it took about 6.

Your crazy. Six pumps would never fill a piece of PVC that size. At least not with a stock pump. Are you sure you have air going into that tank? If you didn't punch a whole in that rubber piece in the goo meter then you wouldn't be getting air into the PVC.

[THIRST]

Look bud, I pump my at2k 6 times. It has no tank extensions, and it works very well. To pump a 3k which has a larger airtank, 6 times, and then to extend that airtank...Its just not gonna work. The air pressure your putting into that is far less than if you pumped it 6 times regularily. My advice to you is to get rid of the extended tank, plug thenhole you made to the regualr airtank with some glue, make your gun work, and make it look cooler.

The reason "its always worse" is because even though the amount of air increases, the pressure decreases dramatically, and the pressure is what counts. Ever noticed on a TT, how it outputs next to no air and it can get ranges of roughly 60 feet? Pressure.

[david00790]

Thank you, Thirst, for explaining that pressure is the main factor in the distance that you get. But, the trick is to find the right balance of barrel friction, air pressure, amount of air, and barrel length. for an at3k with an expanded airtank of that size, 20-25 pumps will give you better range. The downside is that your expanded airtank decreases the rof, which is what the at3k has over the at2k. So to say simply what i am trying to get accross, if you are going to do my expanded airtank mod on the airtech series(which i have been doing for six months.)

1. Give me credit
2. It works best on the at2k
3. Don't over do it, 3-5" of pvc will give you 10-15 pumps and tons of range.
4. Cpvc is the best barrel material for expanded airtanks because it provides lots of barrel friction which works because of a large amount of air at a high pressure.(Use brass size darts, they should fit tightly.)

The purpose of this modification was, for me, to help make the at2k into one of the most moddable guns. i.e. it can be made into a assault wepon, a reliable, and very stong pump pistol, and a long range "loser."

As an afternote, you really need to learn how to cut brass.

Edited by david00790, 25 December 2003 - 09:36 PM.

[rawray7]

he's damn right 6 pumps will fill that whole thing. the 3k pump just isn't designed to get very high pressures, that's why the 2k gets better range. even with that monstar tank extension, he's not going to get any better results without a pump that can handle different pressures. the way that pump is built right into the middle of the gun doesn't really help much either, it's just a lame design. i'd agree with the statement "your either going to get the same results and need to pump more, or get worse results" now the only thing is, you can't pump more, the ergodynamics of the handle and the pressure check on the pump plunger just wont let you, therefore it forces us unto the second portion of the statement "or get worse results", and that's what i can pretty much garantee(sp*) will happen until you get a pump that can handle a higher pressure for higher volumes.

[ShortShit]

It was a nice thought to do, I attempted something MUCH like it years ago on my 2nd SM1500, its just all about the pressure your tank and pump can hold; changing barrel length and dart size are the easy parts.

Edited by ShortShit, 26 December 2003 - 01:45 AM.

[Ares]

nice. atleast he can pump alot, fire, pump once, fire, and keep going until it runs out. More prep, higher ROF.

[THIRST]

No he cant, a 3k valve lets all the air out a once.

[Sylent Blade]

No he cant, a 3k valve lets all the air out a once.

I was thinking that too. The extended tank, which looks to be a bad idea, is not a second air tank. It is an extension. There is no fireing chamber on the AT3k, so all the air is let out of the tank when the pin is pulled. I think that the whole thing is a waste, read CX's AirTech Liquidtron review , there are nearly no improvments, actually, there are tiny drops in preformance. They are stats, believe them. If you want better performance on the AT3k, stick with barrel modifaction, and maybe something with the pump.

[Ares]

Ah, my bad.

[six-hungry-ducks]

Smurftacular!

I have a suggestion. If you put a ball valve on that PVC tank, then extended it a bit (like make a stock), then you would only have to pump once for each shot, and turn the balve valve. Keep it open when you pump then close it. Now, after each shot, open the ball valve, then close it, then pump once (just to make the barrels advance), then shoot, and continue for each shot. You get what I'm saying?

You also might want to tell your armadillo to get a haircut, cause he needs one bad.

[THIRST]

Wouldnt work either, the air would just diffuse and decrease pressure dramatically. My advice to you, is to take the extended airtank off, and have a better looking, better working gun.

[Spoon]

The problem is that no matter how large of a tank you add to the goo chamber, it won't increase range or have any real effect on the shot. The gun simply doesn't store much pressure there, the main pressure chamber is still the white chamber behind the barrel rotation mechanism, that's where the pressurized air that shoots the dart comes from. The pressure that makes the goo go up is just "bleeder" pressure from the main tank. Even if it wasn't, when you fire the gun the valve opens momentarily and then clicks shut again (thats why the trigger "clicks"), so you'd have to mod it to keep the valve open as long as the trigger is depressed. Even THAT wouldn't help however since by the time the pressure in the main tank has beel relieved the dart is already long gone so you'd just be blowing air. If the goo chamber's pressure had any effect on the shot, Cxwq's mod of draining the goo and plugging the chamber would have made a difference in the shot distances, which it didn't.

[lech]

Everything of use has been said, so I'll just say a couple of things:

I did an airtank expansion on my AT3k ages ago, along with a bikepump mod, Don't try to take credit for something that you probably werent the first to do.

Secondly; that AT3k looks like shit.

[andrew01]

Everything of use has been said, so I'll just say a couple of things:

I did an airtank expansion on my AT3k ages ago, along with a bikepump mod, Don't try to take credit for something that you probably werent the first to do.

Secondly; that AT3k looks like shit.

First of all I didnt say I was the first to do it so I dont know what the hell your talking about.

Second of all I really dont care what my guns look like. I would rather have them look crappy and preform very well then look great and preform crappy.

Also, I measured the distance(with a measuring tape on the ground) and shot 10 shots. The guns range was 84ft-92ft.

[NinjaBob]

Your simply not understanding are you? You may have a flux in range, 4 feet more or less here or there. That doesn't matter if your spending 20 minuets reloading that thing. Also, if you wanted to do a tank expansion. Why didn't you do a reasonable sized one? I mean how the hell long is that thing again? Think of the air like water. You fill all that space up with water. You pull the trigger, it opens the valve, the water is now excepting. The pressure pushes the dart out of the barrel, that is what you wanted. Now what good is it if after that happens, water is still coming out of the barrel?

[andrew01]

Your simply not understanding are you? You may have a flux in range, 4 feet more or less here or there. That doesn't matter if your spending 20 minuets reloading that thing. Also, if you wanted to do a tank expansion. Why didn't you do a reasonable sized one? I mean how the hell long is that thing again? Think of the air like water. You fill all that space up with water. You pull the trigger, it opens the valve, the water is now excepting. The pressure pushes the dart out of the barrel, that is what you wanted. Now what good is it if after that happens, water is still coming out of the barrel?

I understand what everyone is trying to tell me and I see the logic in the extendened air tank. But I am just telling you what my guns range is. The range is 84ft-92ft, no lie. I dont think I have a flux in the range, at all. And it does not take 20 minutes to reload the gun, more like 20 seconds to reload every barrell, maybe a bit more or less.

Also do you remeber when there was that topic on "Main Weapons" and that guy did the extended air tank mod to his at2k and got like 150ft. How do you explain that.