Has anyone considered challenging the thumbhole stock on the grounds that it is a reasonable accommodation or as discriminatory for certain individuals with certain physical impairments?
I know that the American's With Disabilities Act define "Federal civil rights laws that ensure equal opportunity for people with disabilities".
I am a disabled person with, among other skeletal abnormalities, limited mobility in my thumb and fingers. I feel I am only able to safely and effectively operate rifles with a thumbhole stock or pistol grip, due to the unique shape of my hands.
I might be a sympathetic plaintiff and this could open the door for others who suffer from more common, and protected, disabilities such as arthritis.