Question, wear on upper by bolt cam

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[ARCHIVED THREAD] - Question, wear on upper by bolt cam

Posted: 10/6/2004 9:51:18 PM EDT

While ogleing my AR, I noticed there is wear in the inside of the upper reciever by the 'bump' on the left side, where the bolt cam rotates. I'm assuming it is the bolt cam hitting the reciever body. What was a parkerized 90 degree corner, is now a beveled, shiney corner. Normal? The upper is a complete upper from RRA, and is 16" midlength.

Posted: 10/6/2004 11:31:53 PM EDT

[#1]

Yes, it is perfectly normal.

Posted: 10/7/2004 1:07:10 AM EDT

[#2]

normal for most ARs and the uppers are anodized, not Parkerized.

Posted: 10/7/2004 8:34:07 AM EDT

[#3]

Also, I have found that the looped head of the firing pin retaining pin sometimes doesn't seat completely below the surface of the bolt carrier. It is possible that this is what's producing the wear.

If I have one that's doing that, I just replace the pin (it's dirt cheap).

It really isn't a problem, but I'm anal enough to replace the pin anyway. I don't like wear that is unnecessary...

Posted: 10/7/2004 8:41:30 AM EDT

[#4]

Quoted:
Also, I have found that the looped head of the firing pin retaining pin sometimes doesn't seat completely below the surface of the bolt carrier. It is possible that this is what's producing the wear.

If I have one that's doing that, I just replace the pin (it's dirt cheap).

It really isn't a problem, but I'm anal enough to replace the pin anyway. I don't like wear that is unnecessary...

Just a thought, but if you replace everything that shows wear, you aren't going to have a weapon that is broken in, you also won't fix any potential problems.

Diagnose, then replace if needed.

Posted: 10/7/2004 9:32:18 AM EDT

[#5]

Been there, done that, got the pics to prove it...

www.ar15.com/forums/topic.html?b=3&f=118&t=203124

Posted: 10/8/2004 12:19:54 AM EDT

[#6]

Quoted:
It is possible that this is what's producing the wear.

reading is fundamental and often ignored here.

[ARCHIVED THREAD] - Question, wear on upper by bolt cam

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