AR-15 Bolt Carrier Discoloration
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Old 02-03-2013, 01:48 AM   #1
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Default AR-15 Bolt Carrier Discoloration

You guys usually have insight into everything. So, I thought I'd come here looking for an answer. Both BCGs are from the same model ar. The bottom one is significantly lighter than the other. The top has never been fired out of the factory and the lower has a 100 rounds through it? What's up with te difference in color? Just different runs in manufacturing?any possible issues in the future (ie rust or corrosion)? Already sent a pic to the manufacturer but wanted to hear all your opinions first.

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Old 02-03-2013, 01:51 AM   #2
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Which model AR? Some brands are very picky about their parts suppliers and others buy the deal of the week, which could explain the difference.

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Old 02-03-2013, 01:58 AM   #3
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Sig Sauer.

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Old 02-03-2013, 02:13 AM   #4
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Looks to me like a piss poor parkerization job ,There are 2 reasons the color change happens . #1 Too low of heat during the process causes a lighter color in the Park or, #2 it didnt get oiled immediately after the process , neither will hurt anything and wont cause problems later its just a cosmetic flaw and I would guess its due to #1

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Old 02-03-2013, 02:16 AM   #5
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By the looks of them the lower (lighter colored) carrier also appears to be the lighter weight/lighter duty/cheaper of the two as well. That's just my own take based on one photo.

But both will probably serve you just fine. And if you're concerned about quality, you could always track down an M16 BCG ($125-200 when you can find them) as an upgrade...and tuck away the light weight as a spare.

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Old 02-03-2013, 02:32 AM   #6
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Quote:
Originally Posted by sweeper22
By the looks of them the lower (lighter colored) carrier also appears to be the lighter weight/lighter duty/cheaper of the two as well. That's just my own take based on one photo.

But both will probably serve you just fine. And if you're concerned about quality, you could always track down an M16 BCG ($125-200 when you can find them) as an upgrade...and tuck away the light weight as a spare.
Sorry but I have to disagree with that. Not only are they from the same make and model but were bought new within a month of each other. It is more likely a finish issue like purehavoc said than a material issue. Sig is really good about being within spec which is why I was surprised by this in the first place. I am curious though, what in the pic makes you think the materials are different and it isn't just a finish issue? For the life of me, I can see a thing. If they were the same color, they'd be almost identical all the way down to the staking.
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Old 02-03-2013, 02:37 AM   #7
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Quote:
Originally Posted by thatguy510 View Post
Sorry but I have to disagree with that. Not only are they from the same make and model but were bought new within a month of each other. It is more likely a finish issue like purehavoc said than a material issue. Sig is really good about being within spec which is why I was surprised by this in the first place.
I wouldnt worry about it honestly , when the park process is below 170 degrees it creates that light color , you can also do it cold and it creates a white to light grey color thats really kind of neat but not really acceptable color finish for a AR
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Old 02-03-2013, 02:46 AM   #8
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Sorry but I have to disagree with that. Not only are they from the same make and model but were bought new within a month of each other. It is more likely a finish issue like purehavoc said than a material issue. Sig is really good about being within spec which is why I was surprised by this in the first place. I am curious though, what in the pic makes you think the materials are different and it isn't just a finish issue? For the life of me, I can see a thing. If they were the same color, they'd be almost identical all the way down to the staking.
I don't think the materials are different. I see a difference in the structure. Admittedly, this could be a case of the angle of the picture fooling my eyes. But the body of the carrier in the top one appears to be the fuller "AR Enhanced" style, while the lower could be the lighter weight "SP1" type. I'm looking specifically at the lower right portions (in the picture) of each carrier.

And again, maybe it's just a deceiving angle in the pic.

Line them up belly to belly, and I suppose you'll have that answered.
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Old 02-03-2013, 02:47 AM   #9
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Quote:
Originally Posted by sweeper22 View Post
By the looks of them the lower (lighter colored) carrier also appears to be the lighter weight/lighter duty/cheaper of the two as well. That's just my own take based on one photo.

But both will probably serve you just fine. And if you're concerned about quality, you could always track down an M16 BCG ($125-200 when you can find them) as an upgrade...and tuck away the light weight as a spare.

Hey Sweeper help me out on one of those PSA lower build kits you have on ebay . I need one to finish up a build ,
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Old 02-03-2013, 02:52 AM   #10
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Quote:
Originally Posted by sweeper22

I don't think the materials are different. I see a difference in the structure. Admittedly, this could be a case of the angle of the picture fooling my eyes. But the body of the carrier in the top one appears to be the fuller "AR Enhanced" style, while the lower could be the lighter weight "SP1" type. I'm looking specifically at the lower right portions (in the picture) of each carrier.

And again, maybe it's just a deceiving angle in the pic.

Line them up belly to belly, and I suppose you'll have that answered.
I see what your saying. If you line the up correctly and not as I did you'd see they are exactly the same. I didn't pay attention to that because my question pertained only to the finish.
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