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Posted: 8/20/2014 12:31:09 AM EDT
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Ok I have a sig 551A1 that has a few issues. The rifle has been refinished with some unknown tan coating (my guess is cerakote or gunkote). The upper receiver has a milled portion that the bolt carrier rides on. The milled portion is spot welded into the receiver. Well there is now rust developing from what I believe is the crevice between the milled block and the stamp "shell". I've scrubbed the area with clp and I can't see any rust but the oil that drains from the area is rust colored. Im trying to find out what I can do to eliminate the rust and what treatment I can coat this thing so that it doesn't rust there again. It can't be something that gets the receiver too hot because that will melt the rubber dust cover lips(from what I've read 200f is as hot as you can go). It also has to be something that can be used on aluminum(or at least match) since the lower is aluminum. Ifalon would be ideal, but it's a bit out of my budget at this point in time. Thanks.
Andrew |
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I suppose water leaked in between the weld?
Best way would probably be to soak it in Kano Kroil to help prevent further rusting. You wont be able to scrape/brush off the rust unless you somehow un-weld it. If you don't have Kroil, you could probably suffice with WD-40. Apply liberal amounts. You could also probably use something like Brownell's Bluing & Rust remover followed by Kroil or WD-40, but you probably won't get rid of all the rust since you cant brush it off. |
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I have no idea if it was rained on or what. It came from the coast so it may have been the humidity.
Yeah unwelding might be a bit difficult, hopefully I can get at it chemically. Any idea on a coating what will give the metal some rust resistance in the crevice that won't get the receiver too hot? Andrew |
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If it were mine and I wanted to get rid of the rust, I'd start by saturating the crevice with a weak acid (like vinegar or lemon juice), let it soak a bit, and flush it out with something like a water pic. Would do the acid then flush till there were no more telltales of rust, then would flush that out with alcohol a couple times, and heat it with a hairdryer to get rid of any water. Then would put a bead of rustolium or any suitable paint at the top of the crevice, and blow it into the crevice so it would coat the area. Prolly would do the rustolium thing a few times to make sure of a good coat. If you can actually slide anything into the crevice it would be a bit easier, since you could abrade the rust directly, and get something in there to spread the paint well.
I'm picturing something like AK internal rails, so if what you have is very different, this might not apply. |
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