congrats on your FNX purchase. (now all you need is an FN/FAL )
Remember, that your FNX has a safety (like the 1911) so I carry mine cocked and locked with one up the pipe for a total of 16 rounds. (actually I'm still carrying my kimber with 15 +1).
The safety is also a DECOCKER.. so you can put one up the pipe and push the "safety" all the way down and the hammer drops (but does NOT fire).
THEN, you can shoot the first round double action if you so desired. The trigger pull is LONG and hard though and then you have to transition back to SA afterwards. I just carry mine 1911 style.
I ordered a holster from crossbreed. they told me it'll be SIX weeks.
IT will be worth it though.
Keep your powder dry.
OH, and BTW... with the straight spring housing plastic grip piece I was shooting LOW. I put the arched "spring housing" piece on and that brought it up more. I have to play with it more. I might still buy some BOMAR adjustable sights. Remember though, a BIG target sight lets OLD eyes see!! With the RIGHT holster, the only drawback to the big target sights is that you fray your shirts there so I buy my shirts CHEEP at Kohls on sale. Hawaiian shirts are good "urban camoflage" so you do NOT "print". Dark colors with a pattern are good, dark colors (solid) are okay. Light colors plain seem to show.
you might also try to go to fiveseven.com I ordered 3 more FIFTEEN round mags before uncle sugar says I can't have them.
Keep me posted on how you like this. I found a good load for it too.
I've also fired it with factory ball 230 grain sellier & bellot, Remington 230 grain JHP, My reloads which is a 230 ball from Montanagoldbullets.com with 5.4 grains of win 231 with a standard large pistol winchester brand primers in mixed cases., and 200 grain SWC lead. It fired em all without a hickup.