Nige, very easy, used 5 inch wire brush in a drill which takes off rust and gives a smooth burnished finish to the steel and leaves the lettering sharp. Cold blue with G96 Gun Blue Crème.
Baz
Cheers Baz, Not tried G96, will give it a go
Thanks
Steyr LP10, Steyr LP5,
Vintage Collection - Walther LP53, HW77k Venom, BSF S20 Match, Original 35, ASI Target plus lots more