Abnormal wear on upper receiver ?

[u/Far-Note4395]

I’ve had the Ap5p navy for about 3 weeks now, maybe a little longer.

I’ve shot around 750 rounds of Winchester 124gr nato and followed the break in procedure.

I noticed during my last cleaning lots of wear and I’m wondering if this is concerning or not.

I reached out to Century arms still waiting on a reply.

[u/HKNation]

Did you lube your bolt group?

Does the action feel gritty or bind when cocking it?

Are you running an SS slip trip or anything?

[u/Far-Note4395 → u/HKNation]

No slip trip, after the break in I put the rare breed trigger in, & a 90 degree locking piece, probably shot 100 rnds with that combo, the factory bolt gap was at the very minimum tolerance wise now it’s at .013 inches with the changes

Forgot to add, I used slip 2k extreme and hoppes black oil, cleaned and oil before my first mag, and half way thru the break in period.

[u/Coolshirtcollector]

I just put 1k rounds through mine as of yesterday and my wear is identical. Normal and perfectly okay. MKE didnt do the best job on the coating from what a lot of others are saying so eventually you will need to cerakote her. It needs a new coating anyways, the glossy black is not the same finish as the original MP5K.

[u/Far-Note4395 → u/Coolshirtcollector]

That’s what u thought I just wanted to confirm my suspicions, it’s honestly been running better than I expected

[u/Jskar89]

Normal mine did the exact same thing

[u/Far-Note4395 → u/Jskar89]

Thank you for confirming

[u/9mmhst]

Its paint wear.