NP3 is very different than your average cerakote or duracoat.  Please go check out Robar's site and read up on the NP3.  When considering protection, durability, and built in lubrication, NP3 is probably one of, if not the best treatment you can add to a steel gun.  It will not affect the gun's cycling or performance at all.  The process in which NP3 is applied is on a microscopic level, hence no need to worry about it affecting the action of the handgun.  Anyone who has an NP3'ed gun or has had one knows exactly what I am talking about.   

Here is my S&W 1006 that I received virtually brand new several years back.  Has about 300 rounds through it, give or take a few.  Was really into the gun after I purchased it, researched everything I could on it.  Eventually, I added a set of Hogue rubber grips and added 22# wolf recoil spring on the gun.  Was sending a Glock in to Robar to be NP3ed and they were running a special, buy 1 treatment and get the other 1/2 off.  FIgured my 1006 was a perfect candidate and that the NP3 would look awesome on the 1006.  So off to RObar the Glock and 1006 went.  Also had both mags NP3ed for the 1006 as well.  This one came back better than I had imagined, and it probably one of the nicest 1006 10mm's anywhere.  Haven't fired the gun since the treatment was applied.  This is one bad ass mofo! 

Contact me via PM or email (sick6gn@hotmail.com) with any questions concerning my 1006.  Thinking of ordering a custom 1911 but in the air still