400 FPS upgrade, Need advise on parts

[Renegade)]

I had a PDI 150% in my ICS, and it just hurt the mech so bad to the ears, hated it, put it in my TM SR, and also a rough, hard sound..

It is now in my spare parts drawer and I have a Systema M120 in her now, runs smooth and hard. I recomend it over ANY PDI..

[DSFD506]

Originally Posted by Skladfin

I guess I'll go with Promethous M120 then?

Are you wanting high velocity, high rof, or best of both ?

[CDN_Stalker]

Originally Posted by Skladfin

I guess I'll go with Promethous M120 then?

I've installed a couple dozen Prometheus springs (100-120) and they are well worth the cash, easy to find, and easier to install in a mechbox. Plus the rate of fire is on the high side of decent.

[Skladfin]

All right, just made the decision. The parts list:

Prometheus M120SP Spring:
http://www.airsoftparts.ca/store2/in...roducts_id=579

Systema Area 1000 Metal Spring guide without Bearings:
http://www.wgcshop.com/pcart/shopper...pring%20Guides

Systema Silent Head Set for Gearbox Ver. 2
http://www.wgcshop.com/pcart/shopper...%20Head%20Sets

These should be just right?

[TokyoSeven]

Do it. Do it now. Do it hard.

[dontask]

why get a spring guide without bearings?

[Skladfin]

Because I just read here that

http://www.google.ca/url?sa=t&ct=res...Rlqdsfau_ZPShA

His spring wouldn't compress enough for it to fire because both the bearing spring guide and bearing piston head was compressing it too much or something like that. Just trying to avoid any trouble =).

Going to order these soon then.

[ILLusion]

Originally Posted by DSFD506

Would it not just be cheaper to get the Systema Complete mechbox with the M150 spring ?

Nope. Not by far.

Canadian retail prices:

$25 - Spring
$25 - Metal Bushings
$27 - Systema v2 Spring Guide
$65 - Systema Silent Head Set
====
$142 - Total

versus:

$430 - Systema Complete Mechbox, M150

Originally Posted by Skladfin

By the way, someone at ASR said this:
"An 8.4v 1200mah WILL NOT WORK. You need a 9.6v, the higher to 4200mah the better. That 8.4v will NOT pull the spring."

This is untrue, correct?

It's mostly true... UNLESS you switch to a torque up gear set. A sub-C pack will crank it fine, but if you stick to standard torque gears, you risk stripping the initial 3-4 teeth of your piston faster in full-auto fire, as well as putting extra stress on your motor.

Originally Posted by Skladfin

All right, just made the decision. The parts list:

Prometheus M120SP Spring:
http://www.airsoftparts.ca/store2/in...roducts_id=579

Systema Area 1000 Metal Spring guide without Bearings:
http://www.wgcshop.com/pcart/shopper...pring%20Guides

Systema Silent Head Set for Gearbox Ver. 2
http://www.wgcshop.com/pcart/shopper...%20Head%20Sets

These should be just right?

That Area 1000 metal spring guide you chose DOESN'T have bearings. It just has a nylon bushing. I would highly recommend the Systema bearing spring guide over the Area1000 version.

Originally Posted by Skladfin

Because I just read here that

http://www.google.ca/url?sa=t&ct=res...Rlqdsfau_ZPShA

His spring wouldn't compress enough for it to fire because both the bearing spring guide and bearing piston head was compressing it too much or something like that. Just trying to avoid any trouble =).

Going to order these soon then.

His setup is messed up, then, because I've installed a bearing piston head (Systema silent head set) with springs of various brands (TONS of Prometheus springs) combined with a bearing spring guide and have NEVER had an issue. It may be a different story if you're using a stock Marui piston head, which has a nut that is about twice the thickness of a piston head's bearings.

[Skladfin]

hmm.

I see, I'll get the bearing Spring guide then.