How to Remove an HK USP Lock-Out

The Heckler & Koch USP (Universal Self-loading Pistol) is a semiautomatic handgun available in 9 mm, .40-caliber Smith & Wesson and .45 ACP. It is constructed on a polymer frame with major internal metal components coated by a Dow Corning anticorrosion process. Built to the specifications of military and law enforcement, the USP incorporates a mechanical recoil reduction system in the buffer spring assembly to reduce perceived recoil to the shooter and dampen the stress on internal components from large-caliber recoil. Another design innovation in the USP series is the patented HK lock-out feature. This mechanism internally locks all movement of the trigger, hammer and slide, preventing the gun from firing. The lock-out is accessible through the magazine well.

Instructions

    • 1

      Point the pistol in a safe direction.

    • 2

      Press the ambidextrous magazine release lever on either side of the trigger guard to remove the magazine.

    • 3

      Insert the two-pronged lock-out key supplied with the USP into the lock inside the magazine well. Rotate the key clockwise to lock the weapon. The two holes in the lock should be horizontal positioned. The pistol will not fire.

    • 4

      Unlock the pistol by inserting the two-pronged lock-out key into the lock inside the magazine well. Rotate the key counterclockwise. The two holes in the lock should be vertically positioned. The pistol will fire when loaded and cocked.