Mine dropped right in with no hassle at all. Yes you will have the hole where the selector switch goes but there are solutions, the Popsicle stick method which has been mentioned already, the fake selector switch which is hard to find but they do come available from time to time or!!! You can just leave it alone and live with the hole, I have as I seem to keep missing the fake selector switches on the EE. Having the hole open leaves the gun susceptible to dirt entering areas where you don't want it but I don't roll around in the dirt with mine and so far it's been fine. It's a personal preference to cover the hole or not, purely cosmetic IMHO.