Reducing FPS on WE SCAR GBBR

[Tex]

Originally Posted by REZ

theirs no easy solution? like... half filling the mag? and i cant just crono it with .4's?

the easy way is use duster like CDN_Stalker posted and no to .40's crono is done with .20's always.

[lemegacool]

Originally Posted by REZ

theirs no easy solution? like... half filling the mag? and i cant just crono it with .4's?

no you cant use a heavier bbs... YES it will slow the bb down... BUT! it will travel with WAY more energy than a .20g witch will make it do MORE damage to its target

what stalker said is THE easy solution... i'll go find you a link of what to use...

use that

[m102404]

http://www.airsoftcanada.com/showthread.php?t=90068

http://www.airsoftcanada.com/showthread.php?t=90003

Basically you need to move the float valve up further. There's a couple of different methods:
- add in a spacer to push it forwards (this is "static", cannot be adjusted easily...does work though)
- use a different float valve with different bore/inlet sizes (this is "static", cannot be adjusted...basically guesswork)
- use RATech's NPAS Adjustable valve (this can be adjusted and so far has held it's setting for A LOT of shots)

Oh yes, of course you can use duster...but when I tried it in my M4 and SCAR...performance reliability was so-so. The recoil springs are pretty stiff and it does need to cycle enough to cock the hammer and feed a bb. If you're going to try it...you need "Tetra"fluoroEthane (or something like that but it starts with Tetra)...the "Di"-whatever stuff isn't strong enough. Yellow cans at Grand and Toy are not Tetra...blue cans at the Source are...don't know other brands.

Chrony-ing for games is done with 0.20g bbs always (or at least it should)...altering the BB weight to cheat the chrony makes you an asshole and a danger to the other players.

[REZ]

Originally Posted by m102404

http://www.airsoftcanada.com/showthread.php?t=90068

http://www.airsoftcanada.com/showthread.php?t=90003

Basically you need to move the float valve up further. There's a couple of different methods:
- add in a spacer to push it forwards (this is "static", cannot be adjusted easily...does work though)
- use a different float valve with different bore/inlet sizes (this is "static", cannot be adjusted...basically guesswork)
- use RATech's NPAS Adjustable valve (this can be adjusted and so far has held it's setting for A LOT of shots)

Chrony-ing for games is done with 0.20g bbs always (or at least it should)...altering the BB weight to cheat the chrony makes you an asshole and a danger to the other players.

Thanks, im gonna try duster and crono it. Hopefully it drops to 320 or less, then were all happy.

were can i find a good duster adapter (and a prope one to)

[CDN_Stalker]

Originally Posted by lemegacool

no you cant use a heavier bbs... YES it will slow the bb down... BUT! it will travel with WAY more energy than a .20g witch will make it do MORE damage to its target

what stalker said is THE easy solution... i'll go find you a link of what to use...

I just told him what to use, is up to him to do the research in the stores by reading the back label and looking for the di or tetra references to the flouroethane. He's been spoonfed enough already, don't waste your time with telling him which brands are which. Biggest problem is, some store I found early on had their duster listed as teraflouroethane, only to find out months later the company that makes it switched their brand to diflouoethane. Best way to drop the velocity a lot is to buy what Staples sells, white can with blue label (haven't bought since 2003 when I started airsoft), it is the diflouroethane. Then move up from there buy shopping at various computer stores (smaller independant stores often stock the stronger tetra, more so than big box stores that sell computers among the hundreds of other types of crappy items (like office and school supplies).

[m102404]

The Airsoft Innovations (AI) duster adaptor works perfect. I personally like the Madbull Propane adaptors.

Airsoftparts.ca has 'em both...if you don't have some, get some lightweight silicone oil at the same time.

Jugglez will have the parts out to you in 2-3 days.

Tys

[REZ]

Anyone willing to test duster on a WE SCAR for me (i dont have a crono, and dont have my SCAR yet). I really would love to be able to use her indoors.

[lemegacool]

Originally Posted by m102404

The Airsoft Innovations (AI) duster adaptor works perfect. I personally like the Madbull Propane adaptors.

Airsoftparts.ca has 'em both...if you don't have some, get some lightweight silicone oil at the same time.

Jugglez will have the parts out to you in 2-3 days.

Tys

or buy a can of butane that comes with little adapters and pick the right one then flare SLIGHLY the tip and voila! 2,50 duster adapter with a can of butane free! lol (dont put butane in your WE you'll ruin the seals)

[CDN_Stalker]

Originally Posted by REZ

Thanks, im gonna try duster and crono it. Hopefully it drops to 320 or less, then were all happy.

were can i find a good duster adapter (and a prope one to)

Airsoftparts is a good start, among others. The kit that has been out the past couple years, the newest version, comes with the propane adaptor, a duster nozzle (that also is a replacement tip for the propane nozzle in case it splits/breaks off), and a bottle of 1.5 weight silly oil.

And, fill your mags before chronying, dry fire (no BBs) 3-6 times before the chrony session. If it's anything like my first tests with my KJW M700 on a hot day (with propane, 710, 690, 610 then settled to 550-560fps for 20 shots after), you need to let the pressure settle before you chrony, otherwise it'll likely be way over at first, possibly making you run a GBB all day (which is my preference for CQB stuff, AEGs are useless in comparison due to size).

[m102404]

Stock WE SCAR (usually shoots ~400fps w/propane w/0.20)

Propane (0.20)-fresh full gas mag...19deg C room
1. 455
2. 449
3. 398.5
wait long enough to type this out and put a couple of BBs in the mag
4. 440
5. 439

[EDIT..TETRA] Duster - same as above (vented propane, wait a bit, fresh full fill of Tetra duster, loaded BBs)
1. 330
2. 300---vent whole mag, bolt didn't cycle

Note: This isn't the first time I've seen Tetra duster vent in a GBBR...both my WE WETTI/AWSS M4 (cut and modded to 330fps w/0.20 for indoors) and my WE WETTI SCAR will vent. Maybe not always on the 2nd shot...but it definitely is not strong enough. It's expensive...so unless I make a mod that I think will work, I don't keep testing with it.

[REZ]

Originally Posted by CDN_Stalker

Airsoftparts is a good start, among others. The kit that has been out the past couple years, the newest version, comes with the propane adaptor, a duster nozzle (that also is a replacement tip for the propane nozzle in case it splits/breaks off), and a bottle of 1.5 weight silly oil.

And, fill your mags before chronying, dry fire (no BBs) 3-6 times before the chrony session. If it's anything like my first tests with my KJW M700 on a hot day (with propane, 710, 690, 610 then settled to 550-560fps for 20 shots after), you need to let the pressure settle before you chrony, otherwise it'll likely be way over at first, possibly making you run a GBB all day (which is my preference for CQB stuff, AEGs are useless in comparison due to size).

Thanks for the wise words! Im hopping i can settle my SCAR down enough to play indoor with it!

[REZ]

Originally Posted by m102404

Stock WE SCAR (usually shoots ~400fps w/propane w/0.20)

Propane (0.20)-fresh full gas mag...19deg C room
1. 455
2. 449
3. 398.5
wait long enough to type this out and put a couple of BBs in the mag
4. 440
5. 439

Duster - same as above
1. 330
2. 300---vent whole mag, bolt didn't cycle

Bolt didnt cycle? so duster... not good?

[m102404]

It's great for that first shot...

(note: I know it sucks...but WANTING it to work, doesn't MAKE it work no matter how much you wish it did)

The way the NPAS type nozzle works, it need a lot of expanding gas pressure to rack the bolt back quick...that trips the hammer, with trips the knocker release (part #66), which stops the flow of gas from the mag.

If the the bolt doesn't cycle fully, the knocker won't be withdrawn and gas will dump/vent from the mag.

You COULD mess around with a weaker recoil rod spring....but I haven't done that yet...let me know (post to the threads I referenced) when you work that out.

[REZ]

Originally Posted by m102404

It's great for that first shot...

so duster may be a issue? cause i need to run a whole mag... not 2 shots

[CDN_Stalker]

Originally Posted by REZ

Thanks for the wise words! Im hopping i can settle my SCAR down enough to play indoor with it!

No problem. Just make sure you have a reliable GBB to use in case your SCAR is FUCT by too hot or malfunction.