gun misfeeds and/or varying ranges

[Zekrom3393]

I'm having problems with my King Arms M16 AEG, When I fire the bb's will either travel a good distance or just roll out of the barrel. I need help here, I want to know if I just have to break in the new hop-up bucking or could it be something else (I installed a ProWin Hop-up and a Madbull 60 degree soft bucking)

[Red Devil]

I had the same problem and it was my piston head. I somehow shredded it.

[kevindagee]

I heard from some people that you need to use O-Rings with the ProWin hop up, not sure yet because I am having issues with my ProwWin hop up myself.

[Warlord]

Yeah I have had massive problems with the m4 prowin hopups and madbull hopup units too. It came down to me just getting either orings or switching to a plastic hopup with orings.

[Red Devil]

My prowin hop up was installed by Luis at S9 airsoft  and there hasn't been 1 problem with it. Chuck fixed my m4 when the bb's did the same thing and it was my cylinder head that was tore up. Probably call then and ask.

[nukeduster]

Massive air leak due to failing or failed o rings, some problem with the hopup, or broken piston or piston head.