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Old April 28th, 2014, 09:07   #1
Trev140_0's Avatar
Join Date: Sep 2011
Feeding Issue---Opinion

I figured this might be a good post to toss up to get the opinion of others.

The "my gun is feeding crap" seems to be a recurring theme.

This can be caused by bb brand, mags with poor or no spring compression or when this post is about.

When upgrades or changes are done outside stock parts, different tolerance and manufacturers are introduced. For example going from one M4 nozzle to another or even hop up housing can change position of stock parts to cause other performance issues.

As many have said here before, its best to change one thing at a time to be certain the new part introduced is not causing issues.

With that said I am looking for confirmation that the picture below is what I think it is.

M4 G&G platform.

You are looking at a CNC hop up (Prowin) housing in the feed tube. This is CNC Machined. I will get back to that later.

The nozzle is an upgrade as well. Don't know the brand. But orange also an upgrade as well. See photo to the right the ORANGE nozzle which is supposed to be fully recessed partially in the hop up chamber.


As mentioned, the reason why I made a point of the hop up housing being CNC machined, is because unlike the typical CAST hop up, the CNC is supposed to be more repeatable in the manufacturing process. With that said, it is also less forgiving. I have not measured the bore opening in the feed tube, but my gut is this is slightly oversized of the 6MM. Perhaps 6.1mm. Will see if I can get gage pins to confirm what this is machined to.

The gun complaint was:
  • Some mags worked better
  • Worked better beginning of the day
  • Some BBs feed better. (this one is me as I used .28 G elite on these and the gun was gamed with .3 this weekend, other brand and has issues)

The 3 above are all not issues, but things that can amplify the clearance issue this gun has.

So two things.

1) Am I sure this is the issue? My gut is yes. Hope to hear others confirm
2) Some suggest to file the nozzle but I want to put the hop up forward. Essentially put a spacer in between the hop up housing and the GB. I know this will put the hop up housing in a slightly forward position my a mm or so, but think this will not cause any alignment issue on the mags.

Opinion please.

"....Your life is ending one minute at a time..."

Last edited by Trev140_0; April 28th, 2014 at 09:10..
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