Good morning Sir,
Quite a few of the boys at Quarry have sent their guns (Daystate's) to Paul Wilson to have adjustable cheek pieces fitted - they look great too ! I believe it costs approx £70 but, Sparky would know for definate.
See thread here
I am hoping to have mine done in a few months - as a Birthday present to me, from me
Just don't tell SWMBO.