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Posted: 12/28/2013 12:13:38 PM EDT
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Building a spare parts kit. Ordered from BCM.
Did not remove from plastic, may return. Questions below with pics: 1.) Gas key below, looks like dirt all over key. Should I take out, oil up, or just return. 2.) BCG, the bolt has areas on teeth where there is "paint chipped off" areas. Should I take out, oil up, or just return. 
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Looks like the key could have preservative on it - ALL parts manufacturers ship their parts with preservative of some kind on them, and I don't know why BCM would bother to clean it off before they shipped it.
The bolt looks like it was test fired. Bolts aren't "painted," so that's not at all what had happened. BCM is a very reliable company. Give 'em a call, or post in their Industry Forum with your concerns. |
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Quoted:
The bolt has just been test fired. I own 7 BCM BCGs, they all look like that. Just take them out and use them, they're gun parts. They don't come all clean and shiny. Thanks to all for good advice, answers. Took key out of bag, first two pics below. Cleaned with some hop's oil, yellowish dirt/grime on rag. Looks cleaned, gtg. Thanks to all. Spare parts kit almost complete. 
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Quoted:
I got BCM BCG during panic early this year and the carrier has sharp edge, where it touches buffer. When ever I am cleaning my rifle, it scratches the buffer ... I am kind of disappointed with it. That's not at all uncommon; I've seen it on several manufacturers' carriers. My AR armoring instructor suggested a fine file or even emory cloth (or in a pinch, a fine emery board) to take that sharp edge off the back of the carrier. Don't get carried away, and pay attention to the groove for the buffer retainer, and you'll be fine. |
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Quoted:
That's not at all uncommon; I've seen it on several manufacturers' carriers. My AR armoring instructor suggested a fine file or even emory cloth (or in a pinch, a fine emery board) to take that sharp edge off the back of the carrier. Don't get carried away, and pay attention to the groove for the buffer retainer, and you'll be fine. Quoted:
Quoted:
I got BCM BCG during panic early this year and the carrier has sharp edge, where it touches buffer. When ever I am cleaning my rifle, it scratches the buffer ... I am kind of disappointed with it. That's not at all uncommon; I've seen it on several manufacturers' carriers. My AR armoring instructor suggested a fine file or even emory cloth (or in a pinch, a fine emery board) to take that sharp edge off the back of the carrier. Don't get carried away, and pay attention to the groove for the buffer retainer, and you'll be fine. Thanks, I was thinking in same way to get rid of it. What about corrosion as it will expose the metal? |
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Quoted:
Thanks, I was thinking in same way to get rid of it. What about corrosion as it will expose the metal? Quoted:
Quoted:
Quoted:
I got BCM BCG during panic early this year and the carrier has sharp edge, where it touches buffer. When ever I am cleaning my rifle, it scratches the buffer ... I am kind of disappointed with it. That's not at all uncommon; I've seen it on several manufacturers' carriers. My AR armoring instructor suggested a fine file or even emory cloth (or in a pinch, a fine emery board) to take that sharp edge off the back of the carrier. Don't get carried away, and pay attention to the groove for the buffer retainer, and you'll be fine. Thanks, I was thinking in same way to get rid of it. What about corrosion as it will expose the metal? You'll expose a very tiny bit of metal at those edges you ease, but simply keeping the end of the carrier lubed will protect it more than adequately. If you're really worried, use some cold blue treatment on the spots you ease. I can't emphasize enough that all you're doing is taking off the sharpness of those edges. Don't even touch anything that isn't sharp. Locate where it's sharp, hit it with two or three light strokes with an extra-fine file and check for sharpness. If it isn't sharp anymore, move on. If you're using an emery board, t might take more passes, but stick to two or three strokes at a time. |
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Quoted: You'll expose a very tiny bit of metal at those edges you ease, but simply keeping the end of the carrier lubed will protect it more than adequately. If you're really worried, use some cold blue treatment on the spots you ease. I can't emphasize enough that all you're doing is taking off the sharpness of those edges. Don't even touch anything that isn't sharp. Locate where it's sharp, hit it with two or three light strokes with an extra-fine file and check for sharpness. If it isn't sharp anymore, move on. If you're using an emery board, t might take more passes, but stick to two or three strokes at a time. Quoted: Quoted: Quoted: Quoted: I got BCM BCG during panic early this year and the carrier has sharp edge, where it touches buffer. When ever I am cleaning my rifle, it scratches the buffer ... I am kind of disappointed with it. That's not at all uncommon; I've seen it on several manufacturers' carriers. My AR armoring instructor suggested a fine file or even emory cloth (or in a pinch, a fine emery board) to take that sharp edge off the back of the carrier. Don't get carried away, and pay attention to the groove for the buffer retainer, and you'll be fine. Thanks, I was thinking in same way to get rid of it. What about corrosion as it will expose the metal? You'll expose a very tiny bit of metal at those edges you ease, but simply keeping the end of the carrier lubed will protect it more than adequately. If you're really worried, use some cold blue treatment on the spots you ease. I can't emphasize enough that all you're doing is taking off the sharpness of those edges. Don't even touch anything that isn't sharp. Locate where it's sharp, hit it with two or three light strokes with an extra-fine file and check for sharpness. If it isn't sharp anymore, move on. If you're using an emery board, t might take more passes, but stick to two or three strokes at a time. |
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Quoted: I did this, tutorial by Quib. http://www.weaponevolution.com/forum/showthread.php?1744-BOLT-CARRIER-LAPPING-DEBURRING-PROCEDURE
this is exactly what i was gonna post. also if you dont have a stone you can take a piece of 1,000 grit wet sandpaper (just use oil instead of water) and place the paper on a piece of glass. |
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Quoted:
I always considered the back of a carrier "self-lapping".  Sometimes the edges (particularly around the groove for the buffer retainer) are sharp enough that they dig into the face of the buffer enough to really damage it. I had one that made a fancy star pattern on the buffer in 100 rounds. A quick pass with an extra-fine file and it was smooth as a baby's bum. Of course that's an example of a very minor burr issue. When a carrier isn't just sharp in a couple tiny spots, then you have more issues. Quib's procedure is a bit more comprehensive, but is for a more severely burred. I'd say try the easy, "couple of passes with a fine file" approach first, and if that doesn't fix it, go with the lapping, which is safer and less likely to take off too much material than hand filing. Quib's procedure also includes mention of cold-bluing the metal exposed by the process - particularly his rounding of the back end of the buffer retainer channel. As shown in his pictures, he got a lot of metal exposed, and in that case I completely agree that it needs protection. My "100 round scraping the buffer" carrier wasn't even slightly shiny after the burrs were cleaned up. |
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