General Data

a. Characteristics.

2 y4 lb

Barrel :

Length

Diameter of bore Diameter of rifling

Rifling, number of grooves

Grooves :

Width Depth

Twist, one turn in

Front sight above axis of bore

0.7325 in.

Lands, width

Cylinder:

Length 1595 in.

Diameter 1.695 in.

Chambers:

Number 6

Diameter:

Maximum 0.4795 in.

Minimum 0.473 in.

Trigger pull 5 to 6V2 lb

Revolver Cylinder Front

BARREL PIN

FRONT SIGHT

THUMB PIECE

LUG ON BARREL

COUNTER-CLOCKWISE ROTATION OF CYLINDER

SIDE PLATE ON RIGHT SIDE OF FRAME

SHORT STOCKS

Figure 79—Left Side Smith and Wesson Revolver M1917 Showing Exterior Differences Between It and the Colt M1917

Strain Screw Smith And Wesson

HAND

\ ^AND LEVER SCREW, STRAIN

PIN, BUTT SWIVEL SWIVEL, BUTT

RIVET, EJECTOR

FIRING PIN PLATE, RECOIL PIN, FIRING

PIN, EJECTOR POSITIONING

SPRING, / SPR,NG' CENTER ROD EJECTOR / COLLAR' EJECTOR

PIN, BARREL ROD, CENTER

BARREL

MAINSPRING SCREW, STOCK ESCUTCHEON STOCK

PIN, STOCK

— BOLT, LOCKING SPRING, LOCKING BOLT PIN, LOCKING BOLT PLUNGER, EJECTOR SPRING, CRANE STOP Jv^ PIN, CRANE STOP X CRANE FRAME CYLINDER SCREW, CYLINDER BOLT PLUNGER SPRING, CYLINDER BOLT PLUNGER PLUNGER, CYLINDER BOLT PIN, CYLINDER BOLT BOLT, CYLINDER PIN, TRIGGER TRIGGER SPRING, HAND LEVER PIN, TRIGGER LEVER LEVER, TRIGGER

BUSHING, CENTER ROD

HAMMER STRUT, HAMMER PIN, HAMMER STRUT SPRING, HAMMER STRUT PIN, HAMMER SPRING, LATCH PLUNGER

LATCH PLUNGER, LATCH

STIRRUP, HAMMER PIN, HAMMER STIRRUP PIN, REBOUND SLIDE SPRING, REBOUND SLIDE SLIDE, REBOUND

Figure 80. — Sectional View of Smith and Wesson Revolver M7977

FUNCTIONING, SMITH AND WESSON REVOLVER M1917

61. FUNCTIONING.

a. Pushing on the thumb piece forces forward the latch to which it is attached by the thumb piece nut. The nose of the latch presses against the end or center rod within the ejector plunger and. in turn, pushes it into the arbor of the crane. This releases the cylinder so that it can pivot on its crane and swing outward to the left. The cylinder can then be loaded with two clips of three cartridges each.

NOTE: This action should never be accomplished with a snap or jerk as it might damage the crane.

While the cylinder is open, the hammer cannot be raised, since the pressure of the latch plunger spring holds the latch forward. In this position, a lug on the rear of the latch is under the rear edge of the hammer.

Latch Plunger Screw

1). When the cylinder is swung back into the frame (fig. 81), the center rod spring, which has a greater pressure than that of the latch plunger spring, forces the end of the center rod into engagement in the frame by pushing the latch backward, thus locking the cylinder in place. At the same time, it disengages the interlocking lug of the latch from under the hammer. The cylinder is thus locked into position for firing, and the hammer can then be raised. In the closed position of the cylinder, the pressure of the center rod spring is assisted by that of the locking bolt spring which is mounted with the locking bolt on lii^^ucj

Figure 81.— Sectional View of Smith and Wesson Revolver M7977

Hammer Down. Cylinder Loaded

Revolvers Handguns
Figure 82.— Sectional View of Smith and Wesson Revolver MJ9I7,

Hammer Back, Trigger Back side of the barrel. This bolt also assists ¡11 maintaining the alinement of the ejector plunger and cylinder when the cylinder rotates.

c. In firing double-action, pressure of the finger upon the trigger causes the upper edge of the trigger to engage the hammer strut and raise the hammer until the nose of the trigger comes into contact with the hammer. Then, the trigger continues to raise the hammer until the latter is nearly in its full cock position (fig. 82), when it will escape from the trigger nose and fall, due to the pressure of the mainspring. When the trigger is pulled back, the rebound slide is also pushed rearward to a point where a projection on the slide is far enough back to prevent the lug on the hammer from coming in contact with it. This permits the hammer to fall the full distance and strike the cartridge.

d. In firing single-action, the hammer is first pulled back with the thumb until it is in the full-cock position (fig. 8*2). In this position, a notch in the front end of the lower part of the hammer is engaged with the nose of the trigger. Pressure on the trigger disengages it from the notch in the hammer, thereby releasing the hammer and permitting it to fall. The hammer will fall the full distance due to the position of the rebound slide. If the trigger is allowed to return to its normal position

NOTE: In firing either single- or double-action, the trigger must remain back while the hammer falls, so that the lug on the lower edge of the hammer will not come in contact with the projection on the rebound slide. If the trigger is allowed to return to its normal position between the time the hammer falls and comes close to the cartridge, the projection on the slide will prevent the hammer from falling the full distance and in turn prevent it from striking the cartridge.

Hammer And Trigger Revolver
Figure 88.—Sectional View of Smith and Wesson Revolver M7977, Hammer Striking Cartridge, Trigger Sack, Cartridge Empty

Also note that the cylinder cannot be opened while the hammer is cocked, since the lug on the rear of the latch is held by the hammer against forward movement.

e. Simultaneously with the movement of the trigger in cocking the hammer, a lug on the upper front edge of the trigger engages in the slot in the cylinder bolt and forces it downward against the pressure of the cylinder bolt plunger and spring. This withdraws the nose of the bolt from the cylinder and permits the cylinder to rotate under the action of the hand. The hand, which is pivoted to the trigger, swings on its pin, thus raising it into engagement with the ratchet on the ejector and revolving the cylinder.

1\ As the trigger continues its rearward movement, the bolt is released from the trigger, permitting its nose to drop into the proper recess in the cylinder as soon as the hand has rotated it enough to bring the next chamber into alinement with the barrel. When the hammer falls, both the hand and the bolt lock the cylinder in such a position that the chamber of the cylinder coincides with the axis of the barrel. Pressure of the hand in engagement with the ratchet is maintained by the hand lever and hand lever spring mounted within the trigger.

NOTE: The bolt also prevents the cylinder from making more than one-sixth of a revolution each time the revolver is cocked.

g. When the trigger is released, the rebound slide, under pressure of the rebound slide spring, forces the trigger forward. The lug on the top edge of the slide also comes into contact with the mating lug on the lower edge of the hammer forcing the hammer backward until the firing pin is withdrawn into the frame of the revolver. As long as the trigger remains in normal position, a blow on the hammer cannot cause it to strike the cartridge, since the lug on the slide will prevent forward movement of the hammer. The hammer can strike the cartridge only when the trigger is pulled the full distance rearward.

li. After firing, the cylinder is again swung open and the cartridges or empty cartridge cases (including clips) are ejected from the cylinder by pressure of the finger on the head of the ejector plunger to the rear end of which the ratchet is attached. Rearward movement of the cylinder, when the plunger is depressed, is prevented by a lug riveted into the left side of the frame.

GENERAL CHARACTERISTICS, COLT REVOLVER

DETECTIVE SPECIAL

62. Description

а. The Revolver, Colt, Caliber .38, 2-Inch Barrel, Detective Special, is a cylinder-loaded, exposed-hammer, selective-double-action, hand weapon. The revolving cylinder of the weapon has six chambers, permitting the weapon to fire six shots without being reloaded. When the cylinder is loaded and closed, the revolver is ready for firing. The action of cocking the hammer causes the cylinder to rotate clockwise and aline the next chamber with the barrel. The exposed hammer may be cocked by the thumb or may be cocked and dropped by the continuous squeezing of the trigger, which performs the double action of cocking and releasing the hammer.

б. If one or more of the chambers are empty, the cylinder should be rotated so that a loaded chamber will be moved into line with the barrel when the revolver is cocked. The closed cylinder may be rotated to its proper position by holding the hammer back at about one-fourth full cock. With the hammer down, the first loaded chamber should be next on the left of the one alined with the barrel.

c. The rate of fire is limited by the dexterity of the firer in reloading the cylinder and by his ability to aim and squeeze.

63. General Data

Weight__________________________________ 1 pound, 5 ounces.

Total length_______________ _____________ 6% inches.

Barrel:

Diameter of bore — Diameter of rifling Number of grooves

Grooves: Width:

Arizmendi Revolver

Figure 84. Revolver, Colt, Caliber .38, 2-Ineh barrel. Detective Special.

Colt Revolver Inch

Figure 85. Revolver, Colt, Caliber .38, 2-inch barrel, Detective Special, with commercially procured grip adapter.

Rifling, one turn in______________________________________16 inches (left).

Lands:

Width------------------------------- 0.055-0.059 inch.

Figure 85. Revolver, Colt, Caliber .38, 2-inch barrel, Detective Special, with commercially procured grip adapter.

Cylinder :

Length Diameter

Chambers:

Number— Diameter :

Maximum Minimum-Muzzle velocity____

(158-grain bullet) 870 feet per second.

Maximum effective range

Blade, fixed.

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