Some Suggestions

[laowho]

I'd probably wanna "season" it by the Lee Shaver method anyway, so my tool #1 would be 0000 steel wool. Second tool would probably be some Eliminator (for copper/lead) and Slip 2000 (for carbon). Dunno why I wouldn't combine. Here are where I learned the aforementioned

Browning and Lee Shaver "Barrel Break-In Process"
http://www.texas-mac.com/Barrel_Break_in_Process.html

Precision Shooting Magazine article on best cleaners
https://www.slip2000.com/blog/precision-...-magazine/

Cheers