lever breech mechanism (LBM)

breech mechanism lever

breech mechanism lever retaining catch

breech-mechanism lever

handle of breech mechanism lever

breech mechanism

breech-opening mechanism

wedge-type breech mechanism

unlocked breech mechanism

vertical wedge-type breech mechanism

vertically-operated wedge-type breech mechanism

belt feed lever pivot spring / belt-feed lever pivot spring

firing-lever spindle actuating lever

flap slat CTL lever / flap and slat control lever

breech

breech face

breech ring (of firearm)

breech screw

breech-loading gun

breech loaded

breech piece socket

breech boresight

breech block pivoted below the level of the chamber

closed-breech scavenger system

blow-back breech block

breech and barrel assy

breech assembly

breech blast

breech block

breech carrier plate

breech casing

breech casing (of quick-firing ordnance)

breech chamber