m39 rusting

W

whitey07

CGN Regular
Rating - 100%
46   0   1
was inspecting my m39 and much to my dismay i found rust in the barrel:mad:realy bums me out because she was mint.i guess i didnt clean it good enough after mil surp ammo.the rust is in a section about 4 inches back from muzzle and is about 2 inches on either side of the grooves.i scrubbed the barrel with a bronze 8 mm brush with various solvents,then i drenched the bore in synthetic 5w20.honestly dont remember last time i shot it ,anyways guess moral of story is clean properly after corrosive.also maybe dont use it in your favourite rifles. from now on im only using it in cheapo refurbs
 
whitey07 said:
,anyways guess moral of story is clean properly after corrosive.also maybe dont use it in your favourite rifles. from now on im only using it in cheapo refurbs
Click to expand...



at least a quick clean and flush with warm water and a few oily swabs until you have more time to clean it. These old guns were made to shoot corrosive ammo and are still around today because former users had spent a few moments of their time to clean it. For my long storage firearms, I take them out once a year push a oiled patch through them and give a quick wipe down with oily cloth before i put them back in the safe.


I doubt the rust you describe will affect anything at the range, but its still a bummer.
 
I wash out the bore with hot water, dry it, then conduct my normal cleaning process. The final step is to make sure I put a nice layer of oil on all of the parts.
 
Nabs said:
I wash out the bore with hot water, dry it, then conduct my normal cleaning process. The final step is to make sure I put a nice layer of oil on all of the parts.
Click to expand...

Yep. And don't panic. These recent refurbs probably had fur growing in the bores before the refurb process, and they all look mint. No biggie, if the crown is good, the rifling sharp, and the shooter calm at the trigger.
 
If there is some pitting visible after the rust has been removed you have to live with it. A lightly pitted bore with sharp rifling can still shoot well, but it will tend to foul quickly as the rough pits will strip material from the bullet jacket. JB paste can be helpful.
 
purple said:
If there is some pitting visible after the rust has been removed you have to live with it. A lightly pitted bore with sharp rifling can still shoot well, but it will tend to foul quickly as the rough pits will strip material from the bullet jacket. JB paste can be helpful.
Click to expand...

And destructive. Like sanding a stock, you can't put it back on.
 
A bore can either be cleaned chemically or by friction. JB paste contains an abrasive which is embedded in an oil medium. Like a bore brush, it cleans by friction. It has been around for a long, long time and works well. It should be used judiciously and sparingly and seems to work best if used with a copper remover like Butch's Boreshine or Sweets 7.62.

JB paste will remove bullet jacket fouling, which is softer than barrel steel. Because of it's abrasive properties it will also smooth out pits. It is not a magic cure, but does have it's place.
 
whitey07 said:
whats the best way to neutralize rust ?
Click to expand...

For a rifle bore start with bore solvent and a bore brush. Follow up with a penetrating oil, like Kroil. This product will flow into rust pits and assist with neutralizing the active rust. After soaking in Kroil for a day or so, wipe clean and use the bore brush again. You can use a product like JB paste to smooth up the bore. You can also use a product like Flitz paste to polish the bore. After this keep the bore well oiled.
You can neutralize active rusting in a bore, but you cannot eliminate the pitting that is left by rusting as pits are actually voids left by the oxidization of steel.
 
You must log in or register to reply here.
Back
Top Bottom