Just how difficult is it to install after-market sights on the P99? I have a P99c in .40 that I really love. I am interested in installing Meprolight night sights. Looking at the OEM front sight on my P99c, it would seem you just twist the sight off with a pair of pliers like you would with the OEM front sight on a Glock. Am I correct? Does the Meprolight use a hex nut design on its front sight? And how do you remove the rear OEM sight on a P99? Is there a sight tool specifically for the P99 or will another sight tool such as the MGW for a Glock or the MGW for the Sig work? If not, does one resort to the old punch, hammer, and vice routine to install the rear? Anything I should be careful about? Thanks.