CK Open Gun - Mark on inside of slide

[johnsonian85]

Hi all

 

I noticed a mark on the inside of the slide rail of my CK open gun (9mm) while cleaning it, I picked it up used and don't have a ton of rounds through it yet.  The gun has STI plastic grip and I'm using all MBX mags.  I recall seeing something on my STI edge .40 (STI plastic grip and STI mags) last year but don't remember being able to feel it with my fingernail like this one.  

 

Is this a normal thing for 2011's (only been shooting them for a year)  or does something need a little more fitting?

 

Thanks for the help.

 

[yigal]

check s.s cut .(  pointed by arrow) . and check that no signs of wear on safety.

and 2 others from   magazine  insertion.

Edited November 10, 2017 by yigal

[RonPogi]

When you reload the feed lips of the magazine hits the raill. Thanks