I've had a tavor for a while now but have been experiencing a few issues with the hop up (or at least it appears to be the hop). It just wont settle. It seems to be over sensative, either firing way too high or as though the hop up is off completely. I'm looking at replacing the hop, which I assume is a standard m4 hop (?). If anyone has any information on what hops will fit the tavor / knowledge on the issue, any advice would be great.