Parts finally arrived today and fitted along with a 700mm barrel that Johan sent me FOC as an apology, velocites are great, run the reg at 170 and getting a hair under 1000 with the 25g Monsters, 950 with 26g slugs in a 600mm slug barrel, very very consistent at these pressures as well.
Now to do some still air 100 yard testing to see how it fares.
It seems that in the UK most of the guns dont have the larger plenum and valve body fitted, of course at 12FPE it doesn't matter but all the FAC guns seem to have the old parts fitted as well, I'm wonder if this has something to do with the distributor.