Every picture I can find here and on completed Ebay auctions show the style of the letters like pictured here and the left one above.
The C, K, 2nd O, spacing between the L and A stand out different to me.
The cross in the A also stands out.
Also no sign of the small Ordnance bomb on the barrel near the slide rails.
I won't have time to pull out my own RMC barrels until this weekend.
May just be me......... But I'm leery of this barrel.
EDIT: Thank You JimF for your Picture help