Wiktionary
n. The stock in a firearm located in the rear of the firing mechanism where one's shoulder is held when shooting
Usage examples of "buttstock".
Dropping his sword, he used his freed right hand to unsnap the clip, then tore the buttstock from her weakened grip and hurled it beyond her reach.
He jammed the buttstock of the M-4000 into the loose rock, using it as a rudder to control his wild descent.
As the weapon roared to life, its buttstock rammed hard against his shoulder.
One of the men held the fray while Ramon beat him with the leaded buttstock of his wrist quirt.
The designers had placed the receiver group and the magazine in the buttstock, behind the grip and trigger housing.
He lashed out with the buttstock of his rifle but only succeeded in handing his weapon to the enemy, who plastered him collar to crotch with paint balls.
Magazine here, suppressor here, foregrip here, bolt here, buttstock here.
Finally she got to it and smashed the lock with the buttstock of the gun, shattering it and making the weapon useless.
The deadly, compact firearm lacked a buttstock but was mounted with a flash hider/muzzle brake.