H&K Mk.23 SOCOM

The Heckler & Koch MK23 Mod 0 is a handgun consisting of a match grade semi-automatic pistol, a laser aiming module (LAM), and suppressor. It was adopted by the United States Special Operations Command (USSOCOM) for special operations units in the 1990s.
While the designation applies to the complete system, it's also commonly used in reference to the pistol component itself. The pistol itself, chambered for the .45 ACP cartridge, was developed by Heckler & Koch, and was selected over the Colt OHWS through USSOCOM's Offensive Handgun Weapon System (OHWS) program. The LAM and suppressor were developed by Insight Technology and Knight's Armament Company (KAC), respectively.

The MK23 Mod 0 was built as an "offensive" handgun for U.S. special operations forces under USSOCOM, as per request made in 1989. Military versions of the firearm have the writing "MK23 USSOCOM" engraved on the slide.
The MK23 is considered a match grade pistol, and is capable of making a 2-inch (51 mm) group at 50 yards (46 m), roughly 4 MOA. Production began in 1991, and it was the basis for the HK USP, which began production in 1993. The MK23 has exceptional durability in harsh environments, being waterproof and corrosion-resistant. It uses a polygonal barrel design, which is reported to improve accuracy and durability. It also features an ambidextrous safety and magazine release on both sides of the frame. The magazine release is at the rear edge of the trigger guard, which is wide enough to allow the use of gloves. A decocking lever is on the left side, which will silently lower the cocked hammer. The MK23 is part of a larger weapon system that includes an attachable laser aiming module, a suppressor, and some other features such as a special high-pressure match cartridge (.45 +P ammunition).
The firearm was tested and found to be capable of firing tens of thousands of rounds without a barrel change. It remains reliable in harsh conditions, making it suitable for use by special forces. The .45 ACP round has considerable stopping power, and yet is subsonic making it suitable for use with a suppressor.
However, the firearm's large size and weight have resulted in some criticism. In response, HK developed the USP Tactical pistol based on the original USP; the Tactical retains much of the performance of the MK23 without the bulky size, but is not able to use the suppressor (due to opposite threading directions) or the LAM. An even more compact pistol than the USP Tactical for counter-terrorist and special forces use is the new HK USP Compact Tactical, which does have its own optional LAM. The USP-CT is lighter and is capable of fitting a suppressor, making it a prime choice for Special Forces on covert operations.
The proposed Joint Combat Pistol (JCP) was intended to accept match grade and +P ammunition. However, it is not clear if the JCP, which absorbed the earlier SOF Combat Program, will be used alongside or replace the MK23 handguns. As of 2006, the JCP has since been renamed and restructured.

Offensive Handgun Weapon System

The MK23 was submitted to the USSOCOM Offensive Handgun Weapon System (OHWS) competition around late 1991 the goal of which was to create an entire pistol package capable of replicating the performance of longer barreled weapons such as submachine guns with many customizable features. Its rival was the Colt OHWS. Though both Heckler & Koch's and Colt's designs were tailored to the demanding requirements of the OHWS competition, the MK23 eventually won.
HK commercially markets the MK23 and derivatives of it, but not the complete SOCOM system. The suppressor is made by Knight's Armament Company, and was selected over the one HK originally included as part of its entry. Insight Technology won the contract to produce the laser aiming module, later designated AN/PEQ-6. One version of the LAM produces a visible light dot, while another produces an infrared dot that can only be seen through night vision goggles. There have since been different LAM models and, at least commercially, different suppressors as well. The first MK23 production models were delivered to SOCOM on May 1, 1996. At last count, 1,986 units were built (serial numbers 23-0101 through 23-2086). It has been reported by some users that the cumulative effects of recoil may occasionally cause the can of the suppressor to become slightly unscrewed, but that it is relatively easy to improvise solutions for the problem. Other users say the pistol's large frame size means its wide grips are not always comfortable for people with smaller hands. Today some special operators choose to use the HK USP Tactical Model instead, because it has a pistol grip that is not so wide and can help to avoid this problem citation needed.

Beretta Px4 Storm Review

The Beretta Px4 Storm is a semi-automatic pistol manufactured by Beretta of Italy and intended for personal defense and law enforcement use. The Px4 uses the same short-recoil, rotating barrel lock as the Beretta 8000 Models and uses exactly the same operating system as the M9/92/96 series, while being completely different in design from either. Light-weight polymer construction with steel inserts, a modular trigger group, fully enclosing slide, Picatinny rail on the chin, and changeable backstrap options for the grip are a radical departure from previous Beretta designs.

Unlike the Beretta 92/96/M9 series, the Px4's trigger guard is rounded for better concealed carry. The takedown pin of earlier models is replaced by a spring-loaded bar, accessed via frame recesses at both ends, which must be grasped and pulled down simultaneously to release the slide. The slide spring is doubly captive, being inserted approximately an inch into the transfer block at one end and a receiving hole in the front of the slide at the other. It is a self-contained assembly, completely captured by the polymer guide. The magazine holds the top round directly behind the barrel's breech end so only a slight feed ramp is needed. This allows the barrel to fully support the case. The 6-R rifling of the barrel generates counter-clockwise torque which is harnessed by the locking system to reduce the amount of pressure required from the rotating barrel lock's cam and pin system to affect unlocking. The steel transfer block's cam pin is 5mm wide and 2mm deep. The entire hammer unit mechanism can be removed from the Px4, without the use of special tools, as a single group. This allows easy access to the firing mechanism for cleaning. The Px4's design makes it impossible to assemble incorrectly from a field-stripped takedown.
Px4 features an interchangeable, luminescent 3-dot sight system (coated in Super-LumiNova) for use in dark or low-light situations. With short exposure to any kind of light, the night sights' luminescence lasts up to 30 minutes. The weapon also incorporates a Picatinny rail under the muzzle to allow flashlights, laser sights and other accessories to be attached.

Removable and Interchangeable Parts

To aid the versatility of the Px4, a number of parts were designed to be removable and interchangeable. These parts include the backstrap, the magazine release button, the slide catch and the hammer unit mechanism. The backstrap is available in three sizes: slim, standard and oversized. The magazine release button can be mounted on either side of the weapon and replaced by one of three types: standard, large or combat (extended). The standard slide catch can be replaced with a slimmer version to avoid snagging when the weapon is drawn quickly from a holster.

Px4 Subcompact

The Px4 Storm Subcompact is a compact Px4 chambered in 9 mm and .40 S&W. It has a DA/SA trigger. The Px4sc uses a tilt barrel system. Light-weight polymer construction with steel inserts, a modular trigger group, Picatinny rail on the chin, a plastic magazine loader and changeable backstrap options for the grip. It is intended for personal defense and law enforcement use with a focus on concealed carry
Beretta is marketing the PX4sc as the most advanced subcompact sidearm in existence. It is lightweight and small. The barrel is stainless steel, to help prevent corrosion from perspiration. The magazine release button is both changeable (two sizes included) and reversible. Finally Beretta’s patented SnapGrip Magazine Extender, extends the grip size down for a more secure grip.
Announced in late 2007, Project Allegiance has Beretta USA footing the bill for a $10,000 death benefit for any law enforcement officer who participates in the program. "Participate" means purchasing a Px4, and registering with the program. It's good for three years after the purchase. Beretta is also offering, as part of the benefit, free counseling, legal, and financial advice to the survivors of the officer who is killed in the line of duty.