I'm a new owner of an FNX 45... (I love her, she's beautiful by the way)... I want to say this first. This is my conceal carry I have no problem hiding it no printing or anything and I am 5'11 142lbs. You have to know how to adjust it if it's noticeable and you don't want it to be. Now to the question at hand. We know the 45 you can carry up to 15 in a clip. To make the gun a bit lighter and to save ammo I keep one in the pipe and load 10 in the mag ( trust me it does makes a noticeable difference, something a female might want to try if she carries this weapon). Some say this will mess up the mag especially with new mags and a new gun. I have barely had this thing a little over a month and I am limited on gun knowledge. I know more than I have in my entire life now and that's not much. Any suggestions!