Gen 4 Model 30 Slide Lock

I have a new Gen 4 Model 30 that is giving me absolute fits when trying to pull down the slide lock to remove the slide. The gun is new to me, but I am not new to Glocks. I have removed Glock slides hundreds of times and know the procedure. For some reason, I just cannot get the slide lock to pull down without help from a third hand. It works. It functions. It is just so tight and difficult to grip. I am thinking of getting an extended slide lock to see if it gives me a better purchase on it, but wanted to run this by you guys first to see if anyone else had/has this problem and what solution(s) work.

Gen 4 Model 30 Slide Lock