After 50 rounds? Sometimes there's some sooting/discoloration on the muzzle end of the slide after shooting perhaps it's that? Either way, Officer X is right...photos would be immensely helpful in this instance.I think he's talking about barrel wear "smiles"
Pretty much this.Don't worry about it shoot it like you stole it
Interestingly enough, that does look like a heat issue due to coloration, but it's not. But, as TJ mentioned, your plastic front site would have been affected as well...if it was that hot. If you want to see something close to your original finish, clean and then wipe it down with a light oil. If you're using a CLP, you might be able to take care of this in one step.If your Glock was getting that hot, the front sights would melt off (if you have the plastic stock ones).
'A good cleaning... 'Just got my 30 SF and took it to the range fired 50 rounds and noticed heat marks on the tip of muzzle (barrel). Was wondering if that is normal or do I need get it checked out.
Yep, soot and carbon build up, or so it would seem. It should come off with a good cleaning. Same thing happens on my guns. Nothing to worry about.