Bell's 1903 MS carbine was owned by Don Henry, co-founder and editor of the Mannlicher Collectors Assn newsletter, at least during the 1990s if memory serves (and sometimes it doesn't!)
As a result, plenty was published about that particular rifle, at least in MCA's newsletters, and there was also an article in the Australian Shooter's Journal in the early 1990s.
I recall the full-length stock was bag-grip and had a slightly elevated comb to suit the cocking-piece peep sight. Bell's Nairobi telephone number was stamped onto the inside of the butt-trap lid.