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Cleaning a corroded bore

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K-Z View Drop Down
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    Posted: November 09 2022 at 3:48pm
Apologize in advance if this topic has already been discussed or if the gunsmithing board is incorrect for this question.

I bought a 1943 Aussi No1 MkIII. Nothing special about it, however the bore is dark with some light pitting at spots, and still has rust in the nooks and crannies. I know the damage has been done and can't be reversed, however what would you recommend for cleaning out the residual rust?

I've ruined 3 bronze brushes, and used plenty of patches but no matter how much elbow grease I use the patches still come out brown.

Any suggestion and tips would be greatly appreciated.  
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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2022 at 9:41am
K-Z, what solvent have you been using? I would try Kroil and bronze brushes. Don’t reverse the brush in the bore, that will bend the bristles making it impossible to reach the bottom of the grooves. Push it right out the muzzle. It’s not a pristine match barrel, so carefully pull the brush back in the muzzle and out the chamber end. After a few dozen passes with the brush, wipe out with a dry patch and then reapply Kroil with a wet patch.

Let it soak in Kroil a few days and repeat the above until your satisfied.  






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Post Options Post Options   Thanks (0) Thanks(0)   Quote Honkytonk Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2022 at 10:52am
Kroil and fine steel wool.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scottz63 Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2022 at 3:24pm
Kroil for sure. It will eat that rust right up.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote K-Z Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2022 at 4:53pm
So far all I've used is hoppe's No.9 and G96 cleaner. I've tried using steel wool with my patches with no real results. I'll see if I can get my hands on some kroil never seen it up here in Onterrible.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote shiloh Quote  Post ReplyReply Direct Link To This Post Posted: November 24 2022 at 8:16pm
The last rusty barrel I cleaned I used a rust desolver I got at CTC. Corked the muzzle then filled the barrel let simmer over nite, drain, transmission oil and a few strokes with a stainless brush, then patch and oil.
Came out pretty good, though still dark and a bit frosted, but it is what it is, rust unchecked can do a lot of damage quickly.
The above mentioned is an excellent method as well, but I`ve never been able to find Kroil around my neighborhood.
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Post Options Post Options   Thanks (1) Thanks(1)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2022 at 4:36am
I add a bit of Kroil to Hoppes 9, helps loosen fouling and carbon in routine cleaning. Got that idea from a very good gunsmith I know.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote scottz63 Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2022 at 5:34am
Originally posted by britrifles britrifles wrote:

I add a bit of Kroil to Hoppes 9, helps loosen fouling and carbon in routine cleaning. Got that idea from a very good gunsmith I know.

That's a good idea. Thanks!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Doco Overboard Quote  Post ReplyReply Direct Link To This Post Posted: November 25 2022 at 7:09am
I sometimes use boiling hot soapy water, then follow up with a Kroil-stiff bronzed brush.

Not a good feeling to me when peering through a bore, observing those dark remnants of that hopeful bit of rifling, then cleaning till it slightly withers away.

Plenty of boiling hot soapy water, in a bucket, will give a good wash. Break up crud etc. Ill even alternate with good doses of liquid wrench or similar (cheap) if the need may be into a big effluent mess of soapy water..
JB bore paste treatment will brighten too, as will shooting/getting the barrel hot.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lawndart Quote  Post ReplyReply Direct Link To This Post Posted: December 15 2022 at 1:10pm
If the Kroil idea doesn't work, you might consider buying some bore lapping bullets from David Tubb to see if that polishes it up.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote Shamu Quote  Post ReplyReply Direct Link To This Post Posted: December 15 2022 at 4:47pm
J-B bore paste?
It worked nicely on my '14 Beezer with the mildly pitted bore?



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Post Options Post Options   Thanks (0) Thanks(0)   Quote britrifles Quote  Post ReplyReply Direct Link To This Post Posted: December 15 2022 at 6:33pm
I’m a believer in JB, hit the throat with 20 strokes of JB every few hundred rounds.  Don’t overdo it tho…


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Post Options Post Options   Thanks (0) Thanks(0)   Quote K-Z Quote  Post ReplyReply Direct Link To This Post Posted: December 15 2022 at 6:41pm
Success!

Kroil was 50 bucks for an 8oz bottle, so I went with what Shiloh said and got some cheap rust cleaner from CTC. Plugged the muzzle with a foam ear plug, and let the cleaner do it's thing for 24hrs. After some thorough brushing I ran some patches down the bore to find this mess. (The leftmost patch). The cleaner worked surprisingly well for removing and softening all the gunk left in the barrel. The center patch was after a second soak (just to be safe). Afterwards I used some J-B bore paste on an old bronze brush, LOTS of patches with hoppes No9 and J-B paste as needed. Now the patches come out clean! The bore aint the best but at least it's clean!


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