This is a discussion on Colt M4/ AR-15 experienced users, Does this look normal ? within the General Firearm Discussion forums, part of the Related Topics category; Hey Fellas, I noticed some wear in my upper receiver, I'm not jumping to conclusions.. Just wondering if it looks normal, the BCG is still ...
What's the rifle make/model?
Is it a build? Or was it bought as a complete rifle?
Can you get a better pic of the wear? Perhaps from the open side of the upper?
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Don't see anything anything odd in the second and third photo , First one looks like kinda cheesy. . Something we are missing in the photos.
Where exactly are you seeing wear marks?
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Look at your fired cases and see if there is any marks on the cases if so you have a timing problem and need to replace your buffer spring. Are you shooting mostly brass or steel case. If you are using reloads are they to hot? If you are using the same ammo pretty much all the time see if there is a recall on it. Think it was Winchester had a recall on 223 where they had to much propellant in them. It hard to really tell what's going on without more info and pics. Take your BCG and extend the bolt all the way out and place it bolt down on a flat level surface and if the bolt goes back into the BCG your gas rings are worn out. Like I said need more info before I could really say what you need to do but the wear I see is not normal.
I do see way more grease than needed. AR's are supposed to run wet, as in oil. dirt / sand loves to stick to grease.
I get down in the dirt with mine, and use oil.
Dirt and sand can eat up aluminum.
My 2 cents.
Based on the pics provided I don't see anything to be alarmed about. I agree with the 6shooter AR's run much better on oil (preferably synthetic) than a grease based lube especially in a sandy/ dirty environment. Good luck!
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