ICS M4 Feeding Problems

[DropHack]

Recently I placed an O ring in front of the hop up, in place of the spring, as the hop up was occasionally shifting forward on shots causing a leak and the shot to lose velocity. The O ring solved the fps inconsistency but now the aeg will only feed every second bb. Could this be fixed using a sector delayer?

Internal Parts
Guarder Infinite Torque-Up Motor
SHS 13:1 gears
3034 Mosfet
Stock ICS tappet
ICS Orange Piston
Element double O-ring cylinder head
SHS AK Long Nozzle

The SHS nozzle is only a few hundred microns ( ~300) shorter than the stock ICS nozzle but gives much better airseal than the stock nozzle.

[Blitz85]

Was it feeding fine before the o ring was installed?
My ICS m4 has a high ROF and without a sector delay chip it has the exact same " every other shot" problem. I would say the 13:1 gears you have installed could be enough to cause the issue of the tappet plate not staying back long enough to feed a bb.

That said, ICS nozzles are just that small bit off from others and I have had an SHS nozzle give me feeding issues to the point that I just use stock ICS ones now.

It really could be either, both are cheap easy fixes though.
If it were me I would do both.

[Kos-Mos]

Your nozzle is probably the issue.
It's too short to feed/seal properly without the oring, and with the oring it does not move back enough.

I always installed M4 nozzles (standard) that I sanded if needed (test first, and only sand slightly if you have feeding issue/every other round feeds.
I had 4 different ICS M4s.

[ox56]

Have you messed with your barrel ring at all cause if it gets loose and the barrel sags the shots wont feed through

[DropHack]

Originally Posted by Blitz85

Was it feeding fine before the o ring was installed?
My ICS m4 has a high ROF and without a sector delay chip it has the exact same " every other shot" problem. I would say the 13:1 gears you have installed could be enough to cause the issue of the tappet plate not staying back long enough to feed a bb.

That said, ICS nozzles are just that small bit off from others and I have had an SHS nozzle give me feeding issues to the point that I just use stock ICS ones now.

It really could be either, both are cheap easy fixes though.
If it were me I would do both.

Before Installing the O ring It was feeding fine but the fps would be inconsistent.

[DropHack]

Correct me if I'm wrong, but do the new ICS M4 nozzles have O rings, I am trying to make the gun as efficient as possible compression wise. Without the O ring, the fps would drop about 100 fps occasionally. I also have not done anything to the barrel ring, only the nozzle change and addition of the O ring.

[ThunderCactus]

300 microns? That's .012", that's huge.
When I was messing around with air nozzle length, increasing the length by .010" would prevent it from feeding at all. Shortening by .010" would cause a 70fps loss.
A regular M4 nozzle of any brand should work fine.
What's your rate of fire? Sounds like you're in the 30rps range.
Should have a sector chip and be short stroking the sector gear by a tooth or two.

[DropHack]

Should I just use a regular m4 nozzle and shave it down. I believe the regular m4 nozzles are about .13mm longer than the ics ones.

The last time I chronoed the rate of fire, it was about 31 rps.

[ThunderCactus]

Try using normal length M4 nozzle with O-ring
Remove O-ring from hop chamber
Short stroke 1 tooth off your piston, should see 15fps consistent loss from that

[Kos-Mos]

Originally Posted by DropHack

Should I just use a regular m4 nozzle and shave it down. I believe the regular m4 nozzles are about .13mm longer than the ics ones.

The last time I chronoed the rate of fire, it was about 31 rps.

That's a M16A1 nozzle.
If you get the M4 nozzle it's really close.

[DropHack]

Alright thanks guys, I will see how a normal m4 nozzle and ss'ing goes.