Ar-15 gurus, help me out please

[ker2222]

Doing some cleaning and maintainable and saw this on inside of upper reviver. What the heck is it? A little cosmetic issue Or something serious.

or something serious?

 

[LRRPF52]

What's concerning you?

Your worn down gas tube flange where your carrier key has scored it down?

Does it run?

 

[Merle]

The wear near the cam pin pocket?

 

[2aBaC̶a̶]

Do you run it that wet?

 

[loveha]

Normal wear pattern.
DDM4V11

Custom build with F1 receiver set.

Custom build with Radian Weapons receiver set.

Sig 716

 

[S197]

How many rounds on it? The coating wear is normal, but it looks like you had a few jams. Post a pic of the bolt face.

 

[Pugster]

Looks like normal wear from the BCG cam pin

 

[JS8588]

Looks like normal wear from the BCG cam pin

This.