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For best results, the breech must be opened at the proper time, just as the forward momentum of the gases reaches its maximum, the peak flow. This means that bore extractors are normally used only on guns with semi-automatic or fully automatic actions, where the breech is opened and the shell ejected as part of the recoil process.
The recoil operation is a type of locked-breech action used in semi-automatic and fully automatic firearms. It also uses energy from the combustion in the chamber acting directly on the bolt through the cartridge head, but in this case the firearm has a reciprocating barrel and breech assembly, combined with a bolt that locks to the breech.
A flip-up barrel and lack of extractor on a Beretta Bobcat semi-automatic pistol. Some very early blowback pistols used ammunition with no rim or extractor groove on the cartridge cases (e.g., 5mm Bergmann), and such pistols, therefore, lacked extractors.
Mauriceau–Smellie–Veit maneuver or Mauriceau maneuver (named after François Mauriceau, William Smellie and Gustav Veit) is an obstetric or emergent medical maneuver utilized in cases of breech delivery. This procedure entails suprapubic pressure by one obstetrician on the mother/uterus, while another obstetrician inserts left hand in ...
The earliest mention of recoil operation in the British patent literature is a patent by Joseph Whitworth filed in 1855 which proposed to use recoil to partially open the breech of a rifle, the breech then being manually pulled the rest of the way back by hand. [4]
A lapping process known as "fire lapping" uses a lead "slug" that is slightly larger than the bore and covered in fine abrasive compound to cut out the constrictions. The slug is passed from breech to muzzle to remove obstructions. Many passes are made, and as the bore becomes more uniform, finer grades of abrasive compound are used.
Breech may refer to: Breech (firearms), the opening at the rear of a gun barrel where the cartridge is inserted in a breech-loading weapon; breech, the lower part of a pulley block; breech, the penetration of a boiler where exhaust gases leave it; breech birth, when the baby is born feet or bottom first
The Blish lock resulted from John Blish's observation of large naval guns. He noticed that the breech blocks of naval guns with interrupted thread breeches remained closed when fired with full charges, but tended to unscrew when fired with light charges. He concluded that dissimilar metals have a tendency to adhere to each other when subjected ...