Is this Rust in my Barrel??

[TNSAF]

Just bought a brand new Mossberg 590A1 shotgun. I haven't fired it yet, and I'm new to gun ownership. I found some rusty coloration in the barrel and was just wondering is this rust or is it something else? Thanks for any help.

[hoghunting]

Easiest way to tell would be to clean the barrel. It could be grease or oil from the factory, but even if it is light rust, it will come clean with a brush and solvent.

Just noticed, Welcome to the forum.

[shortwave]

Welcome to TFL and Congrats on your new shotgun.

Either rust or maybe discoloration from wading when it was shot at the factory.

Either way, as hoghunting said, clean her up and oil her down, she'll be ok.

[Lee Lapin]

Could be rust stain, could be factory preservative, hard to say. Either way, a good cleaning and light lube won't hurt.

[TNSAF]

If it is factory rust and it comes off, will my barrel be more likely to have rust in the future now that there has been some?

[Salmoneye]

Forgive me, but...

What am I looking at?

Is that a rifled bore?

What the heck are all the machining marks???

[Orphanedcowboy]

Linked from here:
Polishing your Barrel updated pics

Try this, it works:

Originally Posted by VAHUNTER

To polish a barrel using this method the following items will be needed.
this has been a proven safe process that has shown great results!!
you will see a mirror finish,better patterns(in most cases ) as well as easier cleanup of your barrel !!!!!!
Green Scotch Brite
J&B Bore cleaner www.Brownells.com
J&B Bore Bright
Kroil Kreeping oil Brownells.com OR www.kanolabs.com

A Drill
Cleaning rod (i use a Hoppes 1/4"- 3pc without the handle)
20ga brush for 12ga ---.410 or 44cal. brush for 20ga.


NOTICE NOT recommended to polish chambers,ports,or chrome lined barrels.
it is NOT Recommended to polish barrel with turkey choke installed.
use a MODIFIED OR IMPROVED CHOKE during polishing process

i have polished over gas ports and barrel ports with No ill effects. but use caution. after polishing be sure to clean all materials out of ports.

using a empty 12ga. hull and a empty 20ga. hull i drill out the primer to the size of my cleaning rod. i insert the 20ga. hull into the 12ga. hull so that brass is showing on both ends.

for 3"chamber use 3"hull for 3.5"chamber use 3.5"hull


this will act as a guide for the rod and a stop for your brush as well as protecting the chamber from being polished.

1. wrap scotch brite around brush

2. apply Kroil and J&b Bore cleaner.


3. insert into chamber push forward until you can insert shell guide fully into chamber.

[Orphanedcowboy]

Continued:

Originally Posted by VAHUNTER

4. start drill as you move rod towards muzzle.

caution--- do Not let patch spin in one place in barrel. rod must be in forward or backward motion while drill is spinning rod



i usually do 100 or more passes using J&B Bore Cleaner
then swab the barrel with Liquid bore cleaner (of your choice) then follow with a couple dry patches to clean out the barrel .

Next step would be to follow steps 1 through 4 using J&B Bore Polish and Kroil.
i usually do 100 or more passes using J&B Bore Polish as well.


add fresh Scotch Brite and J&B and Kroil as needed through out the process

after polishing is complete flush barrel with liquid bore cleaner (your choice) then clean and dry patch.

besure to clean all ports and choke threads when finished

the following pics of what comes out of a barrel during polishing. to the eye this barrel was as clean as possible. i had cleaned it with some of the best solvent on the market. then dry patched until the patch came out white.





if you have any questions please feel free to PM me.
Shawn

[zippy13]

There seems to be a deposit of that same red stuff that would indicate that the stains in question are a foreign substance, not rust.



As with all new shotguns, your gun needs a complete cleaning before you fire it. Until you've cleaned it, don't get too excited about what you see.