Well, picked up my M&P 45 today and the slide release has an audible click when I push it down. My M&P 9mm doesn't click at all it just goes smoothly up and down. I was wondering if the 45 is suppose to do this and if it's going to be an issue? It's not any harder to depress I'm just wondering if it might be rubbing or catching on something that it shouldn't be?