its a brand new marker ... if you are already thinking of upgrading it ???? it does not need it ....then why dont you save a bit more and get an ego11 ? the only 'upgrade' i have on my ego11 is the kush bolt ...and that is only because of my personal preferance .. a little less kick and a little quieter
If the etek 3 violent trigger fits the etek 4 then go for one of those. It will not have any side to side play and it's damn fast. The only downside is you will have to get from the states. Try paintballgateway, they are cheap on shipping.