Spend some time in the FAQs and Help sticky, most all of what you ask is in there, see the Retail Parts page, the camo stocks are H&Rs, they make two, a syn monte carlo and a wood pistol grip low comb, same as comes on the turkey shotgun. GBO sponsor GSI makes mannlicher schnable forend, they don't list them on their website, but they'll em if you ask Ed, sponsor's list is on the GBO home page, link is in the news box.
All synthetic stocks are made by Choate Machine, t-hole stocks are made by Boyd's, but only available thru H&R, H&R makes all the rest of the stocks themselves, or did until Gardner shutdown, that may change.
Tim
H&R Mannlicher, discontinuedsyn monte carlowood camocamo laminated t-hole, also available in cinnamoncinnamon laminate straight stock, also available in camo laminate