If it was made in the 100,000's then line it or rebarrel it, no issue with that.
If it's show room new, it shoots, but won't be new for long, museum piece.
Good shape, but not perfect, a collection piece.
Just one of 100,000 or more that needs refinished then fine to reline or whatever.
Anything is better than broken down & beat up.
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The point of the thread was cleaning...
I won't use a steel bore brush anymore since I got a magnified bore scope.
Bronze, brass or synthetic won't scratch the bore, but steel, even stainless will.
Steel leaves behind smears of dissimilar metals that cause corrosion (electrical galvanic corrosion) and bore cleaners won't remove it.
I have noticed that stiff synthetic bristles don't smash down and wad up, and when they wear they still have sharp edges since they wear on an angle during use.
The WORST thing I see done is using a steel sectional rod (screws together) and going down the bore.
It REALLY ruins the muzzle crown in a hurry.