I don't know enough about what Rich P is experiencing so I cannot rule out a defect somewhere but more than likely a new gun and new mags are going to give some resistance until they wear in a bit.
This is a treatise that ends with insertion of magazines, if you are interested.
From my perspective, quality defensive pistols are designed to function under the most adverse conditions. Dirt, sand, fouling, and human factors etc., affect operation.
Parts are over-engineered to function reliably under adverse, high stress conditions. If you ever felt the magazine springs, mag release spring, or recoil spring was too stiff, they were engineered that way to ensure positive function in combat conditions. Lighten those springs and you can make the gun handle more easily, while diminishing reliability. Ok for the range, but not so much in a gunfight.
The engineers also understand that a person in combat will exert more than "normal" force on the weapon controls. Slides will be racked with greater force, mag releases will be pushed harder, etc.
Based on many hours as a student and as an instructor on the range, and on the literature, magazine and ammo failures, and shooter error, are the causes of most malfunctions. A common failure I have seen is magazines falling out of the gun during firing. Most embarrassing in a gunfight. In fact there was a bodycam video of an officer who reloaded and then his magazine fell out. Fortunately he had another mag and got back in the fight but it illustrates the point.
Stress causes a lot of performance inhibiting things to occur in the human body. We lose some ability for abstract thought, experience tunnel vision and auditory exclusion, we lose some fine motor skills and blood supply is redirected to major muscle groups, among other pucker factors. Based on this knowledge we have developed training strategies for gun handling that match what will happen under extreme stress. We want the student to use major muscle groups wherever possible.
I always taught my students to treat their pistol like they are mad at it and to forcefully manipulate or load the semi-auto pistol in their workspace in front of their face so they don't have to take focus off their opponent. Specifically we want the student to use a full hand atop the slide to work the slide rather than using the slide release or pinch method. And we want the student to insert the magazine without looking at it, and drive it home with the heel of the hand, then smack it again to be sure. We are training for the fight, not for the range. Pussyfooting while working the gun can induce malfunctions. Quality semi-auto guns and magazines are engineered to be handled roughly, and in my experience the more positively you work them the better they work.