IPA: /ˈbʌtˌstɒk/
KK: /ˈbʌtˌstɑk/
The part of a firearm that is located at the back and helps to stabilize it when aiming and shooting.
He adjusted the buttstock of his rifle for better comfort and accuracy.
Buttstock is formed from "butt" (from Old French *butte*, meaning a mound or a target) and "stock" (from Old English *stoc*, meaning a trunk or a post). The word refers to the part of a firearm that is held against the shoulder, resembling a mound or support for stability.
Think of a 'mound' ('butt') that supports the 'trunk' ('stock') of a firearm, helping you remember that a buttstock is the part you hold against your shoulder.