Bought mine from shelf in Kibworth Gun Shop,
So not not much research more Love at first sights
This is the Lady to Own, Large front sight will even allow a half inch UNF Deben Whisper Moderator in tandem with a Brocock thread adaptor, to be fitted,
The Whisper 130 is the dogs danglers for this gun and stops the muzzle flip that 5.6ftlbs
gives you,
Also future proofed as the rear sight block once removed reveals a scope rail, for when you are an old git!
Can only suggest you e mail Brocock for info,
All the best, Bernard.