Kevin,
Greg Hartman had a Win M21 Trap gun tricked out for clays. Not CSMC version but seemd to work well for him. If I remember correctly it was 32" barrels, vent rib, single trigger without engraving. Semi(?) BT front end with a raised/flat rear comb sans cheekpiece (ie Paralell comb).
If he is still around he might be willing to let you try it out. LOP could be adjusted easily with a slip on pad just to give you an idea of how it shoots and what you do/don't like about that particular setup.
FWIW.
Hope all is well.
Regards,
Lee Scroggins
