Steyr Mannlicher M1894
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The M1894 Steyr Mannlicher Blow-Forward, Semi-Automatic Pistol is a semi-automatic pistol.
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[edit] General features
This earliest Steyr Mannlicher pistol, manufactured by FAB.D'ARMES Neuhaussen, Switzerland, was designed to be self loading and to use a special rimmed cartridge in 6.5 mm caliber. The design represented an entirely new utilization of mechanical principles in automatic action called "blow-forward action". In the standard type of automatic action for low powered cartridges, the recoil (or blow-back) is utilized to drive back a movable breech face or block, Mannlicher utilized the principle of a rigid standing breech with the barrel blowing forward to extract, eject, and prepare for reloading. The blow-forward principle has been utilized in very few firearms.
A special barrel housing which carries the sight covers the entire length of the barrel (6.49 in/165 mm) when the arm is closed. A heavy recoil spring is mounted concentrically around the barrel within this housing and is compressed between a shoulder at the forward end of the casing and a shoulder at the rear of the barrel.
An unusual element in this design is a three-armed "barrel-holding lever". It is pivoted above the trigger as shown in the drawing from page 188, Mannlicher Rifles and Pistols, Smith, 1947. Its bottom arm engages with the trigger. The forward arm holds the barrel forward for loading. The rear arm serves as a hammer catch.
[edit] Firing Mechanism
To load this weapon the hammer is cocked. As the hammer rotates on its axis pin, it acts upon the trigger, and the sear snaps into the cocking notch, holding the hammer. The hammer axis pin also supports the center arm of the barrel holding lever, which arm emerges and is raised high enough by its spring to press into a slot under the barrel. The rising thumbpiece on top of the barrel over the breech is then pushed forward. The barrel moves forward until its muzzle emerges from the barrel housing, compressing the recoil spring. The barrel holding lever is snapped into the locking notch in the underside of the barrel, thereby holding it in forward position for charging as shown in the drawing from page 189, Mannlicher Rifles and Pistols, Smith, 1947.
The stripper clip (capacity 5 rounds) is inserted in the clip guide of the receiver and the cartridges are pressed into the magazine. (Note: the clip does not go into the action.) The cartridges are stripped off the clip and pressed into the magazine-well in the handle, compressing the spiral magazine-spring. A lip at the top prevents the cartridges from emerging.
The preferred direction for holding this pistol requires that the index finger be positioned around the frame above the trigger guard, with the middle finger through the trigger guard and pressed against the trigger.
As the trigger is pulled, the sear is released of engagement to allow the mainspring to drive the hammer forward slightly, but the rear arm on the barrel holding lever catches in a notch in the hammer to hold the hammer in firing position. The lowering of the forward arm of the barrel holding lever frees the barrel, allowing the compressed recoil spring to drive the barrel back, stripping the top cartridge from the magazine, chambering the round, and pressing the cartridge head against the standing breech. The spur hammer may be manually cocked to fire, or the trigger can provide a double action movement to raise and drop the hammer.
As the propellant explodes and expands, the standing breech (a rigid, immovable object) acts to prohibit rearward movement of the cartridge and causes the expanding forces to move against the bullet (a somewhat more movable object), propelling the bullet toward the muzzle. The friction of forward motion of the bullet projectile against the inside of the barrel causes the bullet to act as a quasi-plug in the barrel. The barrel (a very movable object) is pushed forward by the motion and direction of the expanding gases against the friction of the traveling projectile, until the bullet exits the muzzle, after which forward motion of the barrel is due to inertia. Forward motion of the barrel is arrested by the progressively increasing tension of the recoil spring. The recoil of this pistol is significant.
The extractor is mounted on the left side of the barrel extension. As the barrel moves forward the extractor draws the empty case from the face of the standing breech to eject it.
The barrel holding lever arm moves up by action of the trigger, and catches the barrel in forward position. The magazine spring, pushing against the follower, forces the cartridges up to present the next cartridge for loading. As the trigger is released and moves forward it acts on the bottom arm of the barrel holding lever causing it to pivot and its forward upper arm to release the barrel. The barrel is then driven back by the recoil spring to load the next cartridge.
[edit] Models
The 1894 was originally classed as a "half automatic or semi-automatic pistol".The overall length of the 6.5 mm model displayed in the photo illustrations on this page is 8.46 in (215 mm), dry weight is 30 oz (850 g).
There were several modifications of this pistol during its production until 1897. In some, the barrel catch does not operate during firing movement, so that the pistol closes to become fully self loading. In no models, however, does the automatic action extend to cocking the self-loading pistol. In all variations the hammer must be cocked by thumb to fire or must be cocked and dropped in double action mechanical fashion by a pull on the trigger.
Experimental versions of this arm were also manufactured with a single action movement in which it was necessary to cock the hammer by thumb for each shot. Other types also used experimental forms of grip safeties. Late versions of these pistols were made to shoot a special 7.8 mm rimless cartridge with a straight sided case.
[edit] Historical references
The pistols were tested by the American Army at the Springfield Armory in June, 1900. They did not recommend the use of the pistol, primarily because of the poor function during the test. Cartridges frequently jammed or misfired, and the barrel burst after the 281st round.
- "While this pistol is very simple in construction the operation of loading is very tedious and slow, and would be almost impossible for a man to load it while on horseback. The muscular exerts practically the same as for an ordinary double-action revolver, while the rate of fire is much slower." (Arsenal of Freedom THE SPRINGFIELD ARMORY 1890-1948, by Lt.Col. William S. Brophy, Andrew Mowbray INC., Publishers, Lincoln, Rhode Island, 1991)
[edit] References
‡ Photographs of 1894 Mannlicher 6.5 mm serial #47 manufactured by FAB.D'ARMES of Neuhaussen, Switzerland
