The HK45 was developed as a product improvement of the highly regarded USP45, first released in the 1995. The Caliber .45 ACP HK45 includes several user-inspired enhancements including changeable grip panels (backstraps), a Picatinny MIL-STD-1913 accessory rail, better ergonomics, and more ambidextrous controls.
Along with the HK45 Compact, the HK45 was developed as a possible candidate for the Joint Combat Pistol (JCP) and Combat Pistol (CP) programs administered by the U.S. military in their search for a new service handgun to replace the 9-millimeter M9. These programs were suspended before completion and no pistols were selected.
The HK45 uses an HK proprietary O-ring barrel for precise barrel-to-slide lockup and optimal accuracy. HK45 barrels are made using the famous HK cold-hammer forging process for superior performance.
 
Sellers Notes:
 
This gun is in excellent condition and includes a ton of valuable gear! The Streamlight TLR-1 HL is in excellent working condition, a very bright 1000 Lumen Light, that also does strobe. The Holster is custom fit to the gun with the Light, that's a $100 value between the holster and the Mag caddy that are included. The bore is strong, with good rifling. This gun will last a lifetime of abuse! We rate this gun at 98% condition. 
 
Specifications:
Barrel Length: 4.46"
Threaded: No
Weight: 31.2 oz.
Front Sight: Dot Night Sight
Rear Sight: Black
Frame Finish: Black
Slide Finish: Black
Safety: Double Action Only, No Manual Safety
Best Uses: Target Shooting/Personal Protection/Duty Weapon/Competition
Capacity: 10+1 Rounds for 2 Mags, and 13 + 1 for 1 Mag.
Magazines: 3 magazines
Action: Hammer Fired
Model: 81001114
UPC Number: 642230269378
MSRP: $1377.12
Includes: Streamlight TLR-1 HL Weapons Light, Mag Extension, Mag Caddy and Custom Holster to fit.