What to do with older BAR 7mm rem mag barrel

[Dirty Foreigner]

I recently got in my hands older 7mm rem mag bar. Rifle still shoots fine but I almost couln't belive it when I saw the inside of the barrel.

You can see it here:

Seems like it has everything, Carbon, copper and (looks like lead) fouling with a sprinkle of pitting for a good measure.

My question is how to proceed with removing of the fouling. Should I even do it? It shoots ok for now, but I'm thinking sooner or later it will need to be cleaned.

 

[Rob5589]

What in the heck is that hole?

 

[KClark]

What in the heck is that hole?

Gas port.

 

[Rob5589]

Gas port.

Thanks. BAR, duh?

 

[Dirty Foreigner]

What in the heck is that hole?

Well, I told you there was some slight pitting.

But seriously, any ideas on how to proceed. I mean that thing will need a lot of elbow grease I don't care what solvent you use. Would it be better just to leave it alone and come to a natural end or would cleaning it help with the longevity?