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 rust inside M4 barel ?

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mystikchepas
Modelgun Enthusiast
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Number of posts : 139
Location / Country : France
Registration date : 2013-05-15

rust inside M4 barel ? Empty
PostSubject: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitimeFri Jun 16, 2017 10:32 am

Hi all,

I think I haven't put enough oil inside my M4's barel (long time ago).
Now it looks like there is some rust inside.
Do you have any idea how I can remove it ?
I tried the coca-cola tips but I do no know if it worked...

rust inside M4 barel ? M4
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claymore
Modelgun Perfectionist
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Number of posts : 1226
Age : 63
Location / Country : London
Registration date : 2008-09-07

rust inside M4 barel ? Empty
PostSubject: Re: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitimeFri Jun 16, 2017 3:23 pm

I tend to use WD40 for any rust problems always works for me
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8ace
Modelgun Perfectionist
Modelgun Perfectionist
8ace


Number of posts : 2554
Location / Country : UK
Registration date : 2008-08-06

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PostSubject: Re: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitimeFri Jun 16, 2017 6:00 pm

It's a tricky one as the cap gas can corrode most things. The best thing is to flush it with soapy water then rinse with plenty of clean water, this should get rid of the phosphoric acid residue, dry fully and apply an oil or WD40.

Hopefully this should stop the corrosion.

8ace
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MadMike
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MadMike


Number of posts : 647
Location / Country : Germany (Stuttgart)
Registration date : 2008-08-06

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PostSubject: Re: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitimeWed Jun 21, 2017 4:17 pm

I can also recommend WD 40. Soak it and let it do it's work.
If the det pin is corroded I think you may need to use a wire brush or sandpaper. This will ruin the chrome lining, but I did not yet find another way to get it clean enough again.
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smootik
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smootik


Number of posts : 1823
Location / Country : Poland
Registration date : 2009-03-03

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PostSubject: Re: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitimeWed Jun 21, 2017 5:06 pm

Water flushing and very mild (paper, cotton tip, soft brush) scrubbing to remove remains of corrosive byproducts.
Phosphoric acid (Coca-Cola) sometimes for soaking (at least a few hours, until rust gets dark) rusted removeable parts such as detonator pin.
WD40 (careful, it can damage plastic) or silicone oil (safe to both plastic and metals) to cover and protect.

Red stuff inside the barrel is not always rust, sometimes it's leftover oxidized byproducts of cap explosion that can be removed easier than rust.

Rusted parts I found on my models so far are old Marushin cartridges (they use steel pins and bottoms), detonator pins, blocking bar inside the barrel of plastic models, top of the magazine (lips, follower, upper area. Other metal parts (non-steel) typically just get the reddish accumulation but not typical rust.
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mystikchepas
Modelgun Enthusiast
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Number of posts : 139
Location / Country : France
Registration date : 2013-05-15

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PostSubject: Re: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitimeSun Jun 25, 2017 9:30 am

Thanks for the tips guys !
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PostSubject: Re: rust inside M4 barel ?   rust inside M4 barel ? Icon_minitime

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