Failure to feed

[DOC 1500]

Don't know if the question was asked,  but how much trouble did the OP have before putting in the new trigger??

[jurek]

I see that we have serious discussion here...
However, like I mentioned already...
Do A, then B then C...
First go to factory settings... Then look for alternatives.

[DOC 1500]

The op said he was going to the range today I wonder how we made out??

[CCWLearner]

I had my first repeatable failure-to-feed on my P-07 in the past couple of weeks.  It is specific to Inceptor ARX Preferred Defense 65gr ammunition.  Their range ammo works fine, but it is shaped slightly different, without the fluting on the bullet.  It only happens when chambering a round from a full 15-round magazine.  It happens with a manual rack of the slide, or after the first shot if I have one chambered and load a full 15-round mag.  I can feel it hanging up, like the spring tension on the full magazine is making those top two polymer tips rub against each other as it tries to strip the first round out.  The ammo works flawlessly from rounds #2 to #15, but #1 of each full mag is a fail.  Never had that problem with any other ammo.

[Winkel]

I'm reluctant to post this because I too believe we should find the root cause before corrections are made, but it could be any number of things.
A few years back, when one of my P-series guns was fairly new, I started having feed problems.  I hadn't changed anything, including ammo. 
I did find that my ammo was kicking up a little burr on the magazine followers, just in front of the brass casing.  I figured it was a long shot but I trimmed the burrs with a razor knife and the problem went away. 
I keep my guns pretty clean and well lubed (at least I did when they were new) so I was baffled by this.
I know it sounds odd, and I've not heard of anyone else experiencing this, but it sure seemed to be a contributing factor. 
Just one more little thing to check. 

[Strongcoffeee]

Hello

Thank you to all members that provided input to my failure to feed and I am very happy to report the problem is solved.  So here is what I did.  I removed the springs from the mags, cleaned the mags and reassembled them and I numbered every mag.  As recommended, I had the original trigger reinstalled and I replaced the recoil spring with a spring from Primary Machines (15lbs)  Yesterday I went to the range and loaded each mag with 10 rounds for a total of 200 rounds.  The first 150 rounds was with a new FMJ ammo and the final 50 rounds was with my freedom munitions.  I am happy to announce that I had zero feed issues and the gun worked great. Problem solved and thank you to all that provided input. 

[DOC 1500]

So we still don't know what the problem was, trigger, mags, recoil spring.

[jurek]

So next step should be to find "guilty" part.
Easy way is to change recoil spring back and find out if you have any malfunctions. If not, install CGW trigger and use Primary Machines spring. Finally use all parts you wanted to be in the pistol....
Hopefully all is gonna be good