Nomenclature

rear sight barrel front ______»__ lockina Ri«rtinn • ' ■

lever lanyard loop

Mk23 Magazine Ejector

trigger magazine release accessory mounting groove slide release axle recess

Figure 2 Right View slide recess for slide release/stop threaded barrel for screw-on suppressor

Barrel Stop Screw

left safety lever decocking lever frame magazine

Figure 1 Left View accessory mounting groove threaded insert for accessory locking flared trigger guard slide release hammer magazine threaded barrel for screw-on suppressor rear sight

Figure 1 Left View barrel front ______»__ lockina Ri«rtinn • ' ■

lever lanyard loop trigger magazine release accessory mounting groove slide release axle recess slide recess for slide release/stop accessory mounting groove threaded insert for accessory locking flared trigger guard slide release left safety lever decocking lever frame

Figure 2 Right View

A. The MK 23 pistol utilizes a modified linkless Browning-style short recoil system to lock and unlock the breech.

B. Upon firing, the pressure developed by the propellent gas forces the slide and barrel assembly to the rear. After approximately 3 mm, the locking block will stop the rearward movement of the barrel as the barrel is pivoted downward due to the engagement of the angled surfaces of the locking block with those located in the recoil spring guide rod. The locking block will disengage from the slide and the slide will continue rearward. The slide will then extract and eject the fired cartridge case, cock the hammer, and compress the recoil spring. The slide moves forward feeding the next cartridge from the magazine into the chamber and locking to the barrel breech.

C. The slide locks open after the last round has been fired and ejected.

1.4 Major Assembly Groups (See Figure 3)

A. Slide - houses the firing pin, firing pin block and extractor; cocks hammer during recoil.

B. Captured Recoil/Buffer Spring Assembly (with guide rod) - absorbs recoil and returns the slide and barrel to their forward positions; reduces impact of slide on receiver during recoil. The recoil spring is "captured" by a C-clip on the end of the guide rod.

C. Threaded Barrel (with locking block) - contains cartridge and propellent gases during firing. The threaded muzzle allows attachment of a screw-on suppressor. The locking block initiates locking and unlocking of the breech during movement of slide. The O-ring holds the barrel tight in the slide until unlocking.

D. Frame - serves as support to all major components; controls functioning of pistol. The slide release locks the slide with barrel and recoil/buffer spring assembly to the metal locking insert cast into the synthetic frame. A lanyard loop is in the bottom of the grip for attaching a lanyard. The trigger guard is flared on both sides to preclude accidental actuation of the magazine release during bolstering.

E. Magazine - holds 12 cartridges in position for feeding and chambering.

F. Slide Release - holds slide to rear when engaged; releases slide when lever depressed.

Mod Slide Lock

A. Slide

C. Threaded Barrel threads guide recoil accessory mounting groove

Semi Automatic Pistol Nomenclature

barrel locking block

E. Magazine threaded insert for accessory locking flared trigger guard

Captured Recoil/Buffer Spring Assembly safety decocker magazine release

F. Slide Release

D. Frame lanyard loop insert

A. Slide

C. Threaded Barrel threads guide recoil accessory mounting groove threaded insert for accessory locking flared trigger guard barrel locking block

Captured Recoil/Buffer Spring Assembly safety decocker magazine release

F. Slide Release

D. Frame lanyard loop insert

E. Magazine

Figure 3 - Major Assembly Groups 1.5 Technical Specifications:

• Caliber .45 ACP (Automatic Colt Pistol)

• System of Operation short recoil, semi-automatic

• Locking System Browning system (modified), linkless

• Caliber .45 ACP (Automatic Colt Pistol)

• System of Operation short recoil, semi-automatic

• Locking System Browning system (modified), linkless

• Length

Barrel

5.87 in.

(149 mm)

Sight radius

7.76 in.

(197 mm)

Pistol

9.65 in.

(245 mm)

• Weight

Magazine (empty)

.24 lbs.

(•110 kg)

Magazine (w/12 rds M1911 Ball)

.81 lbs.

(.366 kg)

Pistol (w/ empty magazine)

2.66 lbs.

(1.21 kg)

Pistol (w/12 rds. M1911 Ball)

3.22 lbs.

(1 -46 kg)

• Trigger Pull

Single-action

4.85 lbs.

(2.20 kg)

Double-action

12.13 lbs.

(5.50 kg)

• Height

5.90 in.

(150 mm)

• Width

1.53 in.

(38.8 mm)

• Muzzle velocity

M1911 230 grain Ball

886 fps

(270 m/s)

+P 185 grain JHP

1142 fps

(348 m/s)

• Maximum Effective Range

54.7 yds

(50 m)

• Maximum Range (M1911 Ball)

1,467 yds

(1,341 m)

• Rifling polygonal bore right hand twist

• Magazine staggered, 12 round capacity

• Safety Features 1. safety lever (manual) 2. double-action mode

• Rifling polygonal bore right hand twist

• Magazine staggered, 12 round capacity

• Safety Features 1. safety lever (manual) 2. double-action mode with 12.1 lb. trigger pull, 3. firing pin block, 4. disconnector

CHAPTER 2- OPERATING : 3TRUCTIONS

SECTION I - SERVICE UPON RECEIPT OF MATERIAL

2.1 Initial Inspection. Upon initial receipt, the pistol is to be inspected to ensure it was received in proper working order.

Step Action Reference

1 Remove pistol and items from container

2 Remove packing material

3 Check for missing items

4 Field strip weapon and inspect for:

Missing parts Proper assembly

5 Clean, dry and lubricate

(if necessary)

6 Assemble

7 Safety/ function check

SECTION II - GENERAL DESCRIPTION

2.2 Description: The MK 23 MOD 0 is a semiautomatic, magazine fed, recoil operated, double/ single-action pistol, chambered for the .45 ACP cartridge up to, and including, the commercial +P cartridges.

WARNING

The MK 23 MOD 0 incorporates single and double action modes of operation. Anytime the trigger is pulled with the safety lever in the fire (down) position and a round in the chamber, the pistol will fire from either the hammer down or cocked position.

2.3 Operation and Characteristics

A. Double/Single Action - For double-action (DA), pulling the trigger will cock the hammer and immediately release it discharging a chambered round. To fire the first chambered round in single-action (SA), the hammer must be manually cocked before pulling the trigger. All shots after the first one will be fired single-action because the slide automatically recocks the hammer after each shot.

B. Magazine - The magazine is produced from sheet steel and has a total capacity of 12 rounds. The rounds are positioned within the magazine in a staggered arrangement. Rounds are visible through the viewing holes located along the back side of the magazine housing. The viewing holes are marked with numerals denoting the number of rounds remaining within. The floor plate can be easily removed for disassembly and cleaning of the magazine components.

C. Loaded Chamber Indicator - The MK 23 pistol does not have a loaded chamber indicator. The extractor does not act as a loaded chamber indicator.

D. Decocking Lever - The decocking lever allows the operator to quietly lower the cocked hammer without concern of an accidental discharge. When the hammer is cocked, it may be lowered safely by moving the decocking lever fully into the decocking (down) position. The decocking lever cannot be depressed (and therefore does not allow the hammer to be lowered) if the safety lever is engaged. The decocking lever always springs back into its disengaged (up) position due to the spring pressure exerted by the decocking spring.

E. Safety Lever - The safety lever is an ambidextrous "thumb" lever located on the rear of the frame. It is actuated by the firing thumb of the operator. The safety lever blocks the release of the cocked hammer when it is in the engaged (up) "safe" position (See Figure 4a). The safety lever is depressed downward into the "fire" position (See Figure 4b). The safety lever is not spring actuated and therefore must be moved manually from one position to the other by the operator.

Mk23 Holster
Figure 4a Safe Position Figure 4b Fire Position

The safety lever cannot be placed in the "safe" (up) position if the hammer is uncocked (down).

WARNING

The pistol should always be carried with the safety lever engaged when carried in the single action mode. While there is a spring detent to prevent this, the safety lever can be moved to the "fire" position (down) with a minimum amount of force. This could happen during careless handling or during removal of the pistol from the holster. Always check the position of the safety lever during handling.

F. Frame - The front and back straps of the fiberglass reinforced polymer frame are checkered to ensure a firm grip, even with wet hands or under conditions of rapid fire. The trigger guard is extended, recurved and grooved to provide a firm grip when using two hands or gloves. The bottom of the trigger guard is flared on both sides in front of the magazine release lever to shield the lever from accidental actuation.

A threa^d insert is molded into the front face ot the trigger guard and the frame is grooved forward of the trigger guard for attachment of an accessory such as a laser aiming device or an illuminator. The frame is a one-piece molded component with metal inserts (locking insert and guiding part) cast into the frame during production. The slide rides on these metal inserts during operation.

G. Slide Release Lever - This lever is used to lock the slide open and for disassembling the weapon. As a slide stop, it is depressed upward by the magazine follower or the operator's finger as the slide travels rearward during recoil or manual operation. The slide release lever engages the recess visible on the left side of the slide and is spring actuated. The slide release spring holds the slide release lever in a disengaged (down) position until required. As a disassembly lever, the slide release lever is removed from the left side of the frame when the slide is held rearward (see para. 3.4). The slide release lever can be actuated by the firing thumb of the right handed operator or the index finger of the left handed operator.

H. Magazine Release Lever - This ambidextrous, spring actuated lever holds the magazine within the grip by engaging in the notch found in the upper third of the magazine housing. Depressing this lever with the firing hand index finger or thumb will allow the magazine to drop from the grip. The magazine release lever is shielded from accidental actuation by the flared trigger guard and the design of the synthetic frame surrounding the lever.

2.4 Cycle of Operation. Begins with weapon loaded, hammer cocked, safety lever disengaged.

barrel locking block (locked)

firing pin hammer

Mk23 Chamber

opposing angled locking surfaces

Figure 5 Firing opposing angled locking surfaces barrel locking block (locked)

firing pin hammer

Figure 5 Firing

A. Firing - (See Figure 5) Pulling the trigger rearward pulls the trigger bar forward. The trigger bar pivots the sear actuator upwards which disengages the firing pin block. At the same moment, the sear is pivoted out of engagement from the lower of the two shelves located on the hammer. The compressed hammer spring drives the hammer forward into the rear end of the firing pin. The firing pin strikes the primer of the chambered round. The propellent is ignited by the primer and propellent gases are created inside the cartridge case. The propellent gases drive the projectile down the polygonal bore which spins the projectile in a clockwise direction as a means to stabilize the projectile's flight.

B. Unlocking - (See Figure 6) The gas pressure and energy produced by the propellent gases push rearward on the slide, which is locked to the barrel by the engagement of the barrel locking block within the ejection port milled into the slide. The opposing angled locking surfaces incorporated into the design of the barrel locking block and recoil spring guide rod cause the rear of the barrel to tilt downward as the slide moves rearward. By the time the slide and barrel have recoiled approximately 5 mm, the projectile has left the barrel and the gas pressure within the chamber has dropped to a safe level. The barrel locking block then disengages from the slide. The slide is now free to recoil rearward independently of the barrel.

barrel locking ejection port

Ejection Port Slide Locking

opposing angled locking surfaces recoil spring guide rod

Figure 6 Unlocking barrel locking ejection port opposing angled locking surfaces recoil spring guide rod

Figure 6 Unlocking

C. Extraction -The empty cartridge case is held firmly against the face of the slide by the claw of the extractor as the slide recoils rearward.

D. Ejection - (See Figure 7) -The rim of the cartridge case strikes the stationary ejector. The empty case is ejected from the open ejection port.

Mk23 Ejector
Figure 7 Ejection

E. Cocking - (See Figure 7) - As the slide continues rearward the recoil impulse is dampened by the buffer spring. The recoil spring is compressed and the hammer recocked.

F. Feeding - (See Figure 8) -The compressed recoil spring drives the slide forward. If the magazine is empty, the magazine follower will lift the slide release to a point where it will stop the forward progress of the slide. If the magazine is not empty, the face of the slide will make contact with the top round in the magazine. The round will be driven from the magazine towards the chamber. The tip of the projectile is guided into the chamber by the magazine lips until the round clears the magazine completely. At that moment the claw of the extractor snaps onto the rim of the cartridge case as it becomes parallel with the bore.

Browning Nomenclature
Figure 8 Feeding

G. Chambering - The slide pushes the cartridge forward until the projectile enters the mouth of the forcing cone of the bore and the face of the slide contacts the rear of the barrel locking block.

H. Locking - (See Figure 5) -The slide presses the barrel forward. As it does, the opposing angled surfaces of the barrel locking block and recoil spring guide rod pivot the rear end of the barrel up into engagement with the ejection port in the slide. The slide is now fully forward and the new round is ready to be fired.

+1 0

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