Best advice to remove rust from inside barrel?

[GunNfun]

A friend stated his Thompson in .308 would open. Huh? The bolt will not open once fired. I confirmed. Fed a cleaning rod through the muzzle and with three taps the bolt let go. Spent brass head stamp covered with wet rust. I’m thinking that once it fired the brass expanded to the rough rusted barrel making it hard to remove or pull the bolt back. Does anyone know?
But oh the rust. On the bolt face and inside the barrel. Has any one tried CLR with patches to remove rust? see picture

 

[Mister Heavyhand]

Get yourself a stainless steel Chore Boy, cut off a chunk and wrap around a bore brush, slather it up with Ballistol, chuck it up on an aluminum cleaning rod in a drill motor at LoOOOOw rpm. Run a patch / rag through, inspect, lather, rinse and repeat as needed.

 

[cmshoot]

SMGDMFH

 

[rumrunner55]

No major obstruction send a round through....no more rust

 

[atljetmech]

308 chamber brush on appropriate length rod section chucked up in drill.
Hopefully it ain't pitted

 

[GunNfun]

Great advice! will give these a try. The pitting is on the outside of the barrel from what I can tell.

 

[Nonliberal]

SMGDMFH

I heard you say this out loud in my head. It was beautiful

 

[ReservoirDawg10]

Barrel is probably toast. Clean as usual and hope for the best. Part of that cleaning as usual needs to be the chamber with a chamber brush and mop.

@Twitch2120 , things could be worse.

Fun fact. If you aren't shooting your rifle, clean that copper out. It doesn't mix well with humidity.

 

[GAgunLAWbooklet]

I agree with spinning a chamber brush on the end of a cleaning rod section using a cordless drill. Personally I would dip it in auto body polishing compound or some other mild abrasive.

 

[ReservoirDawg10]

If ypu are having to use stainless scrub pads, drills and such with polishing compound, your barrel is gone. Don't waste the effort of smoothing the grooves