межа відкриття вогню
firing limit / firing cycles limit
limit velocity / ballistic limit
firing signals (opening, shifting, ceasing fire)
fire limit
limit of fire
slant fire; diagonal fire; oblique fire; fire to the oblique
create an opening
high altitude-high opening (HAHO)
high altitude-low opening (HALO)
high-altitude low-opening parachute technique (HALO)
air intake opening
air inlet opening
belt opening
breech-opening mechanism
breech-opening motor
clear opening
cylinder block inlet opening
feed opening
magazine feed-piece opening
front-sight opening
frame around opening
valve opening lead
muzzle opening
quick-opening cluster
opening portlight
opening charge
opening elevation
opening line of barrage
opening narrative
opening of hostilities
opening range
opening situation