It is normal. There cannot be a space free mating of the frame rails and the slide rails because then there would be too much friction between the surface to function smoothly. I wouldn't worry about it not spend any more energy in noticing it, that is what will cause a distraction by something that is absolutely normal. Forget it and move onto a proper sight picture and recovering quickly to maintain that sight paicture after discharging a round so you can place your follow on shot.

I don't think it will be a problem. My 92FS has smaller gaps than the SIG but, it has it on both sides and shows a trace amount of light. My P-01 is tight as a drum and shows none.

I think you are fixating on a non-issue. Ignore it or the distraction will affest your shooting.

Let's see what 'Webster' says about that.

To be fixated: arrested in development or adjustment; especially : arrested at a pregenital level of psychosexual development

Geez...do you think it's elevated to that degree?

Geez...do you think it's elevated to that degree?

Well let's see -

Do you have acne?

Do you feel tired all the time?

Do you notice if your vision is weakening near blindness?

If so stop staring at the light coming in on the gap between the slide and the frame and concentrate on the sights.

Take 2 aspirin and call me in the morning

From Dictionary.com

fixate:

v. tr.

1. To make fixed, stable, or stationary.

2. To focus one's eyes or attention on: fixate a faint object.

3. To command the attention of exclusively or repeatedly; preoccupy obsessively: "TV and newspapers were fixated on high-technology as the solution to almost everything" (Jay Walljasper).

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You first said "Now that I have discovered it, I wonder if it'll will bug me while", then later made the specific comparisons to your other semi-autos. You tell me

But, none of my posts indicated any fixation, purely commentary with the mildest of concern.

....at least SaltyDog is interested in my health and well being.