Feeding issue: ARS Rubber, Madbull ultimate

[McKee]

Here is my issue:

I have a G&P XM177E1. The nozzle is G&P metal, the hop up unit is mad bull ultimate, the rubber is ARS medium, barrel is madbull 6.03, and the spacer is shredders.


The issue I am having is that the bb will not fire past the rubber. It is almost as if the orifice of the hop up rubber is too tight to allow the bb to go past. I can manually push the bb through with the barrel/hopup assembly removed from the gun, but it wont work inside the gun. It seems intermittent too... sometimes it will shoot just fine, sometimes it will jam completely.. sometimes it can be rectified on full auto, sometimes it can't. This happens with the hop up completely off and a visual check of the chamber confirms the spacer is not protruding in at all.

Also, I had no issues when the stock madbull rubber was installed, and all I changed was the spacer and rubber.

I have on order a modify air seal nozzle (plastic), and a modify rubber incase it's something with the ARS rubber but it's not making sense to me.

Any ideas?

[Styrak]

Did you open up the mechbox at all? Sounds like the nozzle is not attached to the tappet plate, or the tappet plate spring is not attached correctly.

[McKee]

I suspected that too, but it's attatched fine... such a weird problem, almost as if the BB's are over bored or something.. but all I changed was the rubber so it shouldn't make that much of a difference.

[Styrak]

Is the rubber damaged at all? The slightest damage at the nozzle end can make a gun misfire and have airseal problems.

[Thenooblord]

I used to have an old TM M16 and I could never get it to feed with the madbull ultimate hopup, try a G&P or something

[Renegade)]

I had problems with the Madbull ultimate, it was great at first, set the hop, and it shot beautiful, but after awhile, it jammed, misfed, hop all over the place... So in the bin it went.

Try out the new Modify Accurate, I love it, I have had nothing but great performance with it, and its in all of my guns now. Inner gear and orings really keep it snug.

[McKee]

It really seems like a compatibility issue to me.. would be understandable if I changed out the nozzle or something but I didn't. I will post up when I put the new nozzle in what my results are.