Armalite sniper/DMR

[namloot]

Originally Posted by vic_man4

Well, heres what Im doing:
Iv talked with KWA and the unported piston works best with KWA guns, so I wouldnt suggest porting it or getting one.

This is something I don't understand. There is nothing special about the design of a KWA AEG that would make their unported piston head work better then a bellows type.

Originally Posted by vic_man4

Well, heres what Im doing:
Since I changed my cylinder out to a type 0 my guns getting 500fps with the stock M120

500fps w/ .20g BB I assume?
Are you talking about the stock spring that came with your KWA M4?

Originally Posted by vic_man4

Well, heres what Im doing:
If you're intending to change out your spring, KWA gb's and motors can handle m150 springs

With the stock ratio gears?
BTW, there is nothing special about a KWA gearbox that makes it any stronger then other, good quality version 2 gearbox.

[damage]

Originally Posted by vic_man4

Well, heres what Im doing:

Base gun: KWA KM4A1
GB Im keeping stock except for the spring guide, nozzle and cylinder. Iv talked with KWA and the unported piston works best with KWA guns, so I wouldnt suggest porting it or getting one.
Hopup: I bought a TM hopup unit, firefly bucking, big out h-nub.
Barrel: Prommy 650mm 6.03mm TBB
Since I changed my cylinder out to a type 0 my guns getting 500fps with the stock M120, so my setup is reliable (not going to break at all) and quick trigger response.
P.S. If you're intending to change out your spring, KWA gb's and motors can handle m150 springs, but nothing much more because of the v2 gb being "naturally flaued".
Prob. gunna get flamed to shit for being a "KWA fanboy" but who cares, just my input.

500fps on M120:???: your joking right? There is no way you'll get 500 fps on m120 or you got a mislabeled spring.

[Styrak]

Originally Posted by namloot

This is something I don't understand. There is nothing special about the design of a KWA AEG that would make their unported piston head work better then a bellows type.


500fps w/ .20g BB I assume?
Are you talking about the stock spring that came with your KWA M4?


With the stock ratio gears?
BTW, there is nothing special about a KWA gearbox that makes it any stronger then other, good quality version 2 gearbox.

Don't mind him, he's just a KWA fanboy

[Midgetkid]

Dude, Hes not a fanboy. hes giving facts. The KWA was tested with a 16v battery and stood up over 2500 rounds. Try sticking a 16v battery into a stock JG and see what happens, it will strip everything within the gearbox in less than 10 rounds. The KWA gearbox is one of the strongest gearboxes made.

[m102404]

The KWA mechboxes are very nicely built right out of the box.

The solid aluminum piston head is a mistake, IMHO, especially since it is not loc tite'd to it's screw.

The shell has been beefed up near the front...with more material than other version 2 shells. What kind of extra-strength and breakage prevention this provides...couldn't tell you.

I've not seen one break yet...but most have been either shot stock or downgraded to high/mid-300's. Several bags of bbs through each one.

My next build with one will be a low 300fps high speed rig. Nothing over 9.6v...8.4v likely. I'm confident that it'll run for a good long time (or break right away ).

With a properly built mechbox (components scaled to power, well shimmed, not used in extreme temperatures, etc...)...v2's can perform extremely well for tens of thousands of shots.

But the cheapy clone setups...or the ones cobbled together with crappy cheap parts....well, you get what you pay for. Keep in mind that the cheap stuff runs $70-100 overseas and costs much less to produce. That's getting near disposable...use it for a game, burn it out, toss it and buy a new one. The company has already suceeded in their objective...you've bought it. You're fooling yourself if you think they care one iota about how long it lasts you.

Am I a KWA fan-boy? Not really. No more so than I think G&G, CA and a couple of others have put out good products. I do think that KWA missed the boat on a couple of key points in producing their armalite model:
1. Retaining the split hopup design
2. Requiring a "unique" top hopup unit and nozzle
3. Metal piston head
4. Non-loc-tite'd grub screws that secures the barrel to the chamber (at least there's 4 of them)
5. The ridge on their body stub for the stock tube is annoying.

Other than that...nice build.

Tys

[TriChrome]

Originally Posted by Midgetkid

Dude, Hes not a fanboy. hes giving facts. The KWA was tested with a 16v battery and stood up over 2500 rounds. Try sticking a 16v battery into a stock JG and see what happens, it will strip everything within the gearbox in less than 10 rounds. The KWA gearbox is one of the strongest gearboxes made.

For starters no airsoft battery is 16 volts. They come in increments of 1.2 volts. Or it was on a bench power supply, and in that case it wasn't hooked up to a battery.

Second, 2,500 rounds with any combination of parts is in no way, whatsoever, any test of longevity. I've run a stock TM at 450 FPS with only metal bushings for longer than that.

Third, high ROF and breaking the gearbox don't necessarily go hand in hand. It's usually high FPS that breaks gearboxes sooner than high ROF (although I will say that a gearbox only lasts for so many rounds, and high ROF reaches that number faster).

Last, there's enough posts just on this forum (not to mention world wide) about plenty of people cracking the front off a KWA V2 gearbox, just like the other V2 gearboxes made by other companies.

/end KWA fanboy bashing

[m102404]

Not arguing one point or another...just tossing out a neat test.

I had a whack of spare parts lying around so for kicks I made up a stock TM mechbox, with original components +/-
+ reshimmed, regreased
+ M100 spring
+ Systema Magnum Motor
+ Polycarbonate ventilated piston head
+ 9.6v large (think is was a 2300mah battery? 2200? can't remember)

The ROF was over 1300rpm...just over 300fps. After baselining it (ROF and FPS test), I fed it Midcap after midcap as fast as I could (i have 14), then 2 hicaps (winding continuously) and then I just held down the trigger until it broke (dry fire).

From the baseline and approximately how long it lasted...I figure that it made it between 4000-4500 shots before it made "bad noise". That might not sound like much...but a 3 minute burst is a long time, and it's a lot of bbs in the trap. As soon as I heard something bad, I gave it one more good trigger pull , and then stopped.

The only damage that I observed were broken plastic bushings. The gears jammed after the bushings broke and a little bit of plastic wedged between the sector gear and spur gear teeth. It was extremely interesting to note how warm/hot the mechbox shell was (it was cool/cold to the touch when I started).

The gearbox shell was pristine when I cleaned it up...still have it.

Not a be-all-end-all test of any sort...far from it. Just something to say, if you want to see how long something will last...run it until it breaks.

Want to build a 500fps rifle...go ahead. Want to know how long it lasts? Shoot it until it breaks. Want it to last longer? Change something and try again.

[vic_man4]

Originally Posted by m102404

1. Retaining the split hopup design
2. Requiring a "unique" top hopup unit and nozzle
3. Metal piston head
4. Non-loc-tite'd grub screws that secures the barrel to the chamber (at least there's 4 of them)
5. The ridge on their body stub for the stock tube is annoying.

Other than that...nice build.

Tys

Yeah, the hopup unit is unique in the sense that the ridge provides perfect alignment, theres no advantage of a one peice unit being better than a two peice.
The piston head on the other hand...

Originally Posted by Radix

Contrary to popular believe, a ported piston is not always better. In the case of a KWA AEG, a ported piston installed with stock components will not guarantee a better seal or produce measurable performance gains. This is because every component in the KWA gear box is engineered to work as a system and not as individuals. Simply changing out one component for another may upset the balance of the system.
The KWA aluminum piston head and the polymer cylinder head work well together. They were designed to minimize impact but yet produce maximum performance. Changing out the piston head will upset the balance and may not guarantee a better result.

Why would KWA assemble a amazing gun and screw one thing up?

P.S. KWA is also a automotive parts company before airsoft, they have engineers and a extensive lab to test their AEG's to find the best performance, your just dicking perfection by changing out your KWA's piston head. Pardon the language.

[vic_man4]

Originally Posted by TriChrome

For starters no airsoft battery is 16 volts. They come in increments of 1.2 volts. Or it was on a bench power supply, and in that case it wasn't hooked up to a battery.

Second, 2,500 rounds with any combination of parts is in no way, whatsoever, any test of longevity. I've run a stock TM at 450 FPS with only metal bushings for longer than that.

Third, high ROF and breaking the gearbox don't necessarily go hand in hand. It's usually high FPS that breaks gearboxes sooner than high ROF (although I will say that a gearbox only lasts for so many rounds, and high ROF reaches that number faster).

Last, there's enough posts just on this forum (not to mention world wide) about plenty of people cracking the front off a KWA V2 gearbox, just like the other V2 gearboxes made by other companies.

/end KWA fanboy bashing

1.2v x 7 = 8.4v
1.2v x 7 = 8.4v
8.4v + 8.4v = 16.8v
Hook'er up in series.
People round the voltage of batteries, cars are a good example, do you really think a car is 12v exact, not really, their 12.6v, each cell is 2.1v, do the math
2.1 x 6 = 12.6v

Heres the link to the people who did the 16v test, it was 8 high-caps actually
http://www.airsoftgi.com/article_info.php?articles_id=7

Agreed with the /end.