дорнування (нарізи)
rifling
rifling grooves
rifling grooves configuration
rifling imprints
angle of rifling
driving side of the rifling
gripping of projectile by rifling
alarm button
button up
lapel button / insignia / miniature
magazine catch button
panic button
fast slave button
feed-pawl lifter button
focus button
slave button
button switch
button-head
choke button
elevation button
heater button
horn button spring
push-button control
starter button
button / press key
press key / button
lapel button
ident button
fire-control button
firing button