The buttstock assembly also uses a "trigger" style locking mechanism to selectively position and lock the buttstock along the length of the extension tube to adjust the overall length of pull of the weapon.Jeffrey Matthew CahillDaniel Michael...
There exists a wide variation in keyboard systems, tuning, action and construction of these instruments see 'accordion', 'diatonic button accordions' Button accordions from which this extract has been taken Button-down of a collar, able to be buttoned down to the shirt, as over a necktie ...