I have recently purchased a Walther p99, 9mm. I also have two standard 16 round mags. When i have the mag loaded to it full capacity, insert in to gun, it takes a little extra push, it does not slide in and engage the mag catch, say like on my Beretta 92. Also, if you try to drop the mag, again, full 16 rounds mag, you have to really apply some pressure on the mag release, more so than on any other gun i own. These 2 things do not happen when the mag is empty. I was just wondering if it is something inherent with a P99, or not. By the way the gun functions perfectly, has not failed to feed anything.