new AR wear marks concern

anmckenn

anmckenn

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Isit normal to see your bolt lugs starting to round and inside of receiver lines on one side where bilt travels after only 150 round?
 
anmckenn said:
Isit normal to see your bolt lugs starting to round and inside of receiver lines on one side where bilt travels after only 150 round?
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Are you talking about the back of the bolt lug, if so yes, most of the bolts are a straight cut with a little chamfer on the one side of the back edge.
so its normaly to see this, I know as we just spent months working on this .
Many high end brands such as LMT ,KAC ect already rould off the bolt lugs.
Its not an issue as long as the product is made of carpenter 158 of better and heat treated the right way.
bbb
 
150, No marks on face of. Chamber or the female lugs just on bolt lugs and bottom right where bolt travels, like. Wearing. A little groove into aluminium. Just wantedto see if its normal or I should start to think about sending it back to be checked out
 
Dsiwy said:
Well stop using KY on your C7 :p

Curious how many rounds that was? Seen a lot with well over 100,000 rds though them. The cocking handle channel is a bit mangled but still works :)
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The CF cocking handle and other oversize ones wear out the latch recess much quicker and that will be cause to scrap an upper.

The front pivot pin hole wears out before the cam pin wear groove will be cause to scrap a lower.

You can destroy an AR with a pretty low round count if the rate exceeds design specs. Heat is worse than large round counts, particularly for bbl.

Or less than 10 k with a piston kit.
 
C77 said:
The CF cocking handle and other oversize ones wear out the latch recess much quicker and that will be cause to scrap an upper.

The front pivot pin hole wears out before the cam pin wear groove will be cause to scrap a lower.

You can destroy an AR with a pretty low round count if the rate exceeds design specs. Heat is worse than large round counts, particularly for bbl.

Or less than 10 k with a piston kit.
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Yeah the tac latch does cause alot of wear but the upper reciever wear does not seem to cause any problems. Thank god we got solid cocking handle pins though, the old ones had a 6 month lifespan with my units abuse.
 
I'd say it looks like it would without any lube (in the cocking handle channel). and the bolt face seems normal. It's just the nature of the beast. Lube it well and keep checking it out. I would sugest frog lube on the cocking handle to help create a nice thick layer in the channel eh.
 
That looks like excessive wear, but the bolt does not touch that. The wear there is from the cam pin. Check the cam pin for damage or a burr.

Also, there is no ferrule on your gas tube. It's worn out.
 
Excessive wear, u think, i lube with m-pro 7 and like i said only 150 rounds. Think there is a manufacturer issue here? Its a german sig 516
 
C77 said:
That looks like excessive wear, but the bolt does not touch that. The wear there is from the cam pin. Check the cam pin for damage or a burr.

Also, there is no ferrule on your gas tube. It's worn out.
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I think that is a piston not gas tube...end is rounded, look at the other pic with the BCG...no gas key visible where it should be.

Boltgun
 
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