Hello, I recently bought this zero trigger device. The trigger sear slid up and down, so when I installed, I had to use electrical tape to hold the bottom of the trigger sear from slipping down (Even after I cut down the trigger guard, it didn't fit). I can currently use the gun without the trigger guard this way, but obviously this is not correct. I am not sure whether or not the trigger sear isn't going in all the way or the fact that the trigger sear is only supposed to go in that much and I am required to cut in more of the trigger guard. Ideas?