вільний затвор
back blow
blow back
blow-back
blow-back action
blow-back operated machine gun
back-blow
breech block pivoted below the level of the chamber
breech block
breech-block carrier
breech-block crank
breech-block detent
wedge-type breech-block
vertical sliding breech-block system
face of breech block
cylinder block (engine block)
feed block slide (feed-block-actuating slide)
back on the block
back-to-back circuit
back-to-back connection
back-to-back radio stations
back-to-back relay
crushing blow
direction of the main blow
dodge a blow
hit a blow
launch a blow
main blow
atomic blow
blow (one's) cover
blow a safe house
blow dry
blow gun