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  2. Flapper locking - Wikipedia

    en.wikipedia.org/wiki/Flapper_locking

    As the bolt is forced backwards after the firing of a cartridge, the flappers recede back into the bolt, therefore unlocking and sending the bolt backwards to cycle the gun. The design was patented in 1870 by Lieutenant Friberg of the Swedish Army, but the first actual example of a firearm that used this was made by another Swedish man named ...

  3. FMK 9C1 - Wikipedia

    en.wikipedia.org/wiki/FMK_9C1

    A single-action-only (SAO) firing mechanism, which is named Fast Action Trigger (FAT) by the manufacturer. There has been different versions of this trigger, [7] the current one is identified by the number 804 engraved on its left side. Some of the 2nd generation of the pistol have the bill of rights engraved on the slide.

  4. Bolt (firearms) - Wikipedia

    en.wikipedia.org/wiki/Bolt_(firearms)

    A turn bolt refers to a firearm component where the whole bolt without using a bolt carrier turns to lock/unlock. This is mostly used to describe manually operated bolt action firearms, but also on some automatic firearms. The most common locking mechanism on rifles is a rotating bolt, which can be classified as a rigid type of bolt lock. Semi ...

  5. Borchardt C-93 - Wikipedia

    en.wikipedia.org/wiki/Borchardt_C-93

    The Borchardt C93 is a semi-automatic pistol designed by Hugo Borchardt in 1893.. The design is based upon the Maxim gun's toggle lock mechanism. The pistol uses a locked breech and a short recoil operating cycle, with the barrel and breech moving backward together for a short distance before the breech is unlocked.

  6. QSZ-92 - Wikipedia

    en.wikipedia.org/wiki/QSZ-92

    The decision to develop a new pistol was made in 1987 to replace the Type 54/64/77. [4] Research and development started in 1992. [4] Development of the QSZ-92 pistol began in 1994 and was adopted by the People's Liberation Army's forces in 1998. The export variants (9×19mm versions) include the CF-98 (barrel life c. 8,000 rds) and the NP-42 ...

  7. Roller locked - Wikipedia

    en.wikipedia.org/wiki/Roller_locked

    roller locked action diagram. In roller-locked arms in the locked position during firing, the rollers rest on parallel surfaces relative to the bore axis on the bolt head, so no amount of force pushing back on the bolt can cause the bolt to unlock. When chambering a fresh cartridge the bolt head is used to push out the rollers.

  8. Washer (hardware) - Wikipedia

    en.wikipedia.org/wiki/Washer_(hardware)

    Split washer or spring lock washer A ring split at one point and bent into a helical shape. This causes the washer to exert a spring force between the fastener's head and the substrate, which maintains the washer hard against the substrate and the bolt thread hard against the nut or substrate thread, creating more friction and resistance to ...

  9. Welrod - Wikipedia

    en.wikipedia.org/wiki/Welrod

    The original Mk1 Welrod is a bolt-action design. [4] Though 500 were ordered, its not clear if it ever got beyond the prototype stage. [4] The Welrod Mk II, chambered for .32 ACP is the primary model. [1] [5] Due to poor field results, the Welrod 9mm Mk I was subsequently developed using 9×19mm Parabellum rounds. [6] [5]