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Old 11-13-2008, 05:44 PM
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ICS M4 Problem

Today, I took my gun out to test fire it for the first time in about a month, the first few shots were accurate, and everything was good. however, after like 5-10 shots, the gears would spin but not fire.
The gun is entirely stock save for an M120 spring. The battery was basic Ni-Cd 8.4v 1800mah, recently charged on a smart charger.It hasnt had any problems in the past, even with the new spring.
Could anyone out there help me with determining and fixing what wrong with it? Any and all help is much appreciated.
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Old 11-13-2008, 06:25 PM
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Check your piston, it might have stripped. That happened to me and a new systema one has been working great in it.
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Old 11-13-2008, 07:24 PM
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Its your piston, open your uper recieve up and look at the rear tooth of the piston. It's probably sheared right off. This is a cheap and easy fix that most guns go through. When you go to buy your new piston remember to also buy a piston head that goes along with it as well. ICS stock pistons are as single piece with the head permentatly attached to the rest of the part.
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Old 11-13-2008, 08:05 PM
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Thanks cutthroat and spectre for the help. I opened up the gearbox and checked, the last like 2 teeth of the piston just broke off. Would you by chance know of any good quality piston and piston head that isn't too expensive. And would you recommend an aluminum or policarbonate piston.
Thanks again.

Last edited by dcorr68; 11-13-2008 at 08:09 PM.
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Old 11-13-2008, 08:22 PM
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I replaced mine a few years back with a Systema aluminum teflon coated piston with an Systema Area 1000 aluminum piston head. No problems since, and it shouldn't cost you over $30 to do. I would suggest anything aluminum, as I have seen polycarb break much easier. One thing I will say, if you go with either aluminum or polycarb, make sure both parts are the same material, or else the stress of one against the other will shorten its life span. Yet again, something I learned through experience.
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Old 11-13-2008, 08:42 PM
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Quote:
Originally Posted by Spectre View Post
I replaced mine a few years back with a Systema aluminum teflon coated piston with an Systema Area 1000 aluminum piston head. No problems since, and it shouldn't cost you over $30 to do. I would suggest anything aluminum, as I have seen polycarb break much easier. One thing I will say, if you go with either aluminum or polycarb, make sure both parts are the same material, or else the stress of one against the other will shorten its life span. Yet again, something I learned through experience.
I have the same items he has in my M4, however my Area 1000 is a ball bearing. 25 bucks for the piston head, but i think its worth it. I will say that my M4 is a lil loud with those mods.
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Old 11-13-2008, 09:07 PM
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Ok, thank you guys so much, I'm most likely going to go with the Systema Aluminum piston, and the Area 1000 Systema Aluminum piston head.

Heres a link to the piston:
http://www.airsoftgi.com/product_inf...roducts_id=621

And heres a link to the piston head:
http://www.airsoftgi.com/product_inf...roducts_id=145
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Old 11-13-2008, 09:12 PM
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if i were you i'd add a ball bearing spring guide. That way your spring can rotate freely thus relieving some twisting stress.
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Old 11-13-2008, 09:26 PM
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Quote:
Originally Posted by Mavrick View Post
if i were you i'd add a ball bearing spring guide. That way your spring can rotate freely thus relieving some twisting stress.
Thanks, I was kind of wondering what the ball bearings really did. If thats the case, it will be well worth the 4 extra dollars.
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Old 11-24-2008, 07:24 PM
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My friend had that problem and it ended up to be his motor, he had to take that screw on the bottom of the handle and tighted it. Sometimes tou have to take the motor completly out. Hope that helps! 203
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Old 11-27-2008, 11:02 PM
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Quote:
Originally Posted by 203 View Post
My friend had that problem and it ended up to be his motor, he had to take that screw on the bottom of the handle and tighted it. Sometimes tou have to take the motor completly out. Hope that helps! 203
Unless the adjuster on the bottom of the motor plate suddenly stripped, the gun wouldn't just suddenly stop firing.
Not to mention that if the motor is so far out of adjustment that it isn't operating the gearbox, it would make an absolutely HORRIFIC gear-death noise.

It's an ICS, so checking if the piston is stripped is literally a 12 second job of knocking out 1 pin and giving the upper a little yank.
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Old 11-27-2008, 11:04 PM
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Yeah, i checked it out. It was the piston and I'm ordering a new piston and piston head as soon as I get the chance
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Old 11-28-2008, 04:16 AM
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dcorr, spectre is exactly on track. I also have an ICS M4 and I had the same issue you described - gears spin, but the gun wouldn't fire. This resulted from boosting FPS with a spring that the piston couldn't handle. I tried both polycarb and aluminum pistons and piston heads from Systema - aluminum has been far more durable. Best of luck with the fix!
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