M4 feedramp anodizing wear?

[bb223]

Noticed some wear on my 6920's lower right feed ramp after firing it.

Sorry for the crappy pictures but it is the best I could do with an iPhone.






Now the weird part is is that there wasn't any wear in that spot yesterday when I wiped all the old oil off and re-lubed it with fresh stuff.

It had to have happened today when I was testing out some reduced loads in once fired Tula cases. I fired 5 rounds of the handloads from the magazine while manually racking the bolt each time.

Anyway, do you guys think the steel case dinged/scraped the anodizing like that? At first I though it was case material that was deposited on the ramp, but I tried to get it off without success.

I didn't think the steel case would be hard enough to mark the ramp like that so I am not 100% certain it is actual damage.

But in case it is, would that be a "weak spot" that I would have to pay attention to from now on? Like would it be more prone to chip or wear further or whatever?

Weird reloading experiments aside, I consider myself relatively knowledgeable on ARs but this is something I have no idea about.

Thank you.

[Junkie]

What brand is the upper?

[bb223]

Whole rifle is factory Colt 6920 bought in 2009, has about 6k rounds through it.

[sinlessorrow]

What mags, should be fine though.

Most mags like pmags sit the rounds high enough that the M4 feedramps could be removed and you would never know.

[bb223]

Early 2010 production PMAG.

Yeah I hit it with a bright light it's definitely worn/nicked anodizing.

I had to trim a few cases maybe there was a burr left over that I didn't remove completely.

I'm not too terribly concerned about it, I just never saw firsthand or heard anyone talk about wear like that.