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Posted: 5/12/2016 1:12:55 PM EDT
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Quoted:
Apparently you're running it dry - lube it more often, or store it better. I used CLP on it before I fired the first round and have only fired 40 rounds on two separate occasions. I didn't run it dry and it's stored in my gun safe so I'm not sure how to store it better. |
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Maybe slight rust, but looks to be more like fouling alone isntead.
Spray the tail of the bolt with CLP, let is sit for a few mins, then break out a green scottbrite pad to clean the fouling off the tail of the bolt. Hell, most of the time If I'm in a rush, will just chuck the tail of the bolt in a drill, and spin clean the fouled section with a scottbrite piece of pad quickly instead. Also, give the inside of the carrier gas section a good shot of CLP, and clean it as well (Q tip will work after the CLP has been allowed to dissolve the fouling. Note, CLP has a cleaning agent int it, and will clean discolve fouling pretty quickly on its own. Lastly, before you store the rig, give all the metal surfaces a light coat of CLP to prevent rusting during short storage. |
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Quoted:
Maybe slight rust, but looks to be more like fouling alone isntead. Spray the tail of the bolt with CLP, let is sit for a few mins, then break out a green scottbrite pad to clean the fouling off the tail of the bolt. Hell, most of the time If I'm in a rush, will just chuck the tail of the bolt in a drill, and spin clean the fouled section with a scottbrite piece of pad quickly instead. Also, give the inside of the carrier gas section a good shot of CLP, and clean it as well (Q tip will work after the CLP has been allowed to dissolve the fouling. Note, CLP has a cleaning agent int it, and will clean discolve fouling pretty quickly on its own. Lastly, before you store the rig, give all the metal surfaces a light coat of CLP to prevent rusting during short storage. I appreciate the info. With it being virtually new I wasn't sure if it came from the manufacturer like that or if it is normal with so few rounds fired through it. I've never seen it before on my other BCG's so that's why I asked. Thanks again! |
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As others have pointed out, it is pretty much normal carbon/fouling and is common, common, common in ARs. It contributes to the conversation about how dirty direct gas impingement weapons are but for me it's just part of the drill. Get used to regularly including stripping and cleaning the bolt as part of your routine maintenance.
Enjoy. |
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I am going to have to against the grain here, and say that something doesn't look right. It looks like the finish is worn off on the band towards the middle of the bolt, and exactly where you are thinking it is rusted. I have seen bolts with many time more than 40 rounds that don't appear to have the finish worn away like that.
I have also never seen anything other than black carbon build up on the bolt tail. I would take some Scotchbrite and some lube, as recommended, and clean the tail really well. If the finish is gone under that rust looking stuff, either something went wrong during the finishing process, or you were sold a bolt with many more rounds through it than was claimed. Did you buy it through a reputable vendor, or used from someone claiming it was new? For comparison, I am looking at a Spike's bolt that I bought about two month ago and I have about 40 to 60 rounds through it on a new build, with nowhere near the wear yours shows. Mine only has a partial ring of wear, all the way to the left, like yours shows. |
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Quoted:
I am going to have to against the grain here, and say that something doesn't look right. It looks like the finish is worn off on the band towards the middle of the bolt, and exactly where you are thinking it is rusted. I have seen bolts with many time more than 40 rounds that don't appear to have the finish worn away like that. I have also never seen anything other than black carbon build up on the bolt tail. I would take some Scotchbrite and some lube, as recommended, and clean the tail really well. If the finish is gone under that rust looking stuff, either something went wrong during the finishing process, or you were sold a bolt with many more rounds through it than was claimed. Did you buy it through a reputable vendor, or used from someone claiming it was new? For comparison, I am looking at a Spike's bolt that I bought about two month ago and I have about 40 to 60 rounds through it on a new build, with nowhere near the wear yours shows. Mine only has a partial ring of wear, all the way to the left, like yours shows. Was also thinking this. Mine never appeared that way after so few rounds and the phosphate should be intack still if it was finished properly, given if the rifle is new. If bought new from vendor/store, I would certainly show them this, looks like rust to me IMO. |
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Are you sure it's rust and not some type of fouling? Is anything else on the gun rusted? What type of ammunition are you using? As for using Breakfree CLP, if you just squirted it from a bottle and didn't shake it first, then there is a chance you only applied solvent, as if you put CLP into a clear container you can see it separate into 3 layers where the solvent will be up top. There was a study done several years ago on CLP showing its rust inhibiting properties only last about 30-days.
CY6 Greg Sullivan "Sully" SLR15 Rifles TheDefensiveEdge.com (763) 712-0123 |
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Quoted:
I purchased it brand new from Joe Bob Outfitters on 3/19/2016, so about two months ago. No other part of the rifle inside or out is rusted. I fired exactly 2 (20 round) boxes of Remington UMC 120 grain OTFB from my local gun dealer. That is carbon, not rust. Some rifles will exhibit an orange tint due to a tiny amount of copper being present with the carbon, deposited by a minute amount being removed from the projectile as it passes the gas port. Also, some Russian ammo can leave a similar-looking buildup. As far as the wear on the girdle of the bolt, I wouldn't worry about it. That bolt appears to be manganese phosphated vs zinc phosphate. It's main purpose is to provide friction wear resistance via being porous enough of a surface to hold lubricant, until the surfaces wear together. Just keep it well lubed and you are good to go. |
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I contacted a rep at Spike's Tactical and showed him the pics and this was his response:
"Actually, that's not rust. It's Copper. For some reason, and I can only speculate that it has to do with the size and position of the port in certain Barrels, 300BLK can deposit copper on the back of the Bolt like that. It gets scraped off the projectile as it passes the port and then gets melted and blasted through the gas system and deposited on the back of the Bolt. Eventually it stops once the edges of the port (inside the Barrel) wear down a little bit. It will take quite a bit to get it off. I use a Dremel with a wire wheel to get it off my Bolts." I did as he stated and got the copper deposit off, along with a little of the finish. I'm glad I got some clarification. I thought it was rust on a new BCG and was worried because everything I've ever bought from Spike's has been really top notch. Just thought I'd share this in case anyone ran across this issue like me and didn't know the difference. |
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