I just got a p30. It's my first HK, and I'm having trouble field stripping it. I cock it then pull the slide back to where the notch lines up with the end of the slide release. I then try to pull the left slide release out and it only comes out half way. It seems no matter what position I have the slide in and no matter how hard I try to get the release off it won't come all the way out. What am I doing wrong? Thanks