This is a very scarce Pietro Beretta Model 92F that has been factory modified with an external slide lock and an extended barrel to use with the KAC Snap-On 9 mm silencer. This design of pistol was developed in the late 1970s at the request of the Navy initially and then later the U.S. Army. The basic M92F pistol was used to which a one-piece yoke was attached to the underside of the pistol. It was hinged on two screws at the front end, with the rear end swinging up and down. At the rear of this yoke mechanism was a locking lug that when pushed upwards would engaged into corresponding notches on the underside of the slide. This would prevent the slide from cycling when the pistol was fired which made it much quieter. Very similar to the original concept used during Vietnam on the S&W Model 39s, a.k.a. the "Hush Puppy" as the Navy SEALs used them to eliminate guard dogs. As noted the pistol is also fitted with an extended barrel designed for use with the KAC silencer. This scarce pistol comes with its original Beretta blue plastic case with a manual and a number of plastic wipe inserts for the silencer. There are several references to this pistol design and KAC silencer noted on pages 303-305 in the book "The U.S. Military Automatic Pistols 1945-2012" by Meadows.

Designed by Knight's Armament Company circa 1979, the Snap-On (also known as the XM-9 in military service) that was made to fit on the corresponding Beretta M92F semi-automatic pistol, with a spring loaded locking device that engages cutouts on the sides of the barrel when installed. When in place the top section of the locking device actually functions as a raised rear sight and there is a corresponding small silver bead on the top front end of the suppressor that acts as a front sight. Approximately 5 1/2 inches long and 1 1/2 inches in diameter. The outside of the tube is marked, "MFG. BY KNIGHT'S ARMAMENT/VERO BEACH, FL./9MM SNAP-ON/SER. NO. D444251Z".