A frame lug for a firearm having a receiver or barrel hingedly mounted to a frame is provided with a tension post having an external thread that adjustably engages with an internal thread of a vertical bore in the frame lug. The tension post provides a height adjustable top surface upon which the receiver or barrel rests when in a closed position and maintains a tight metal-to-metal connection to improve precision of fitting together the receiver or barrel and the frame. Firearms may have the frame lug installed therein or be retro-fitted with the frame lug. In a retro-fitting method, the firearm's frame lug is removed, a threaded vertical bore is machined at least partially into the frame lug, and an externally threaded tension post is adjustably engaged with the vertical bore such that a top surface of the tension post provides a tight fit with the receiver or barrel.

A practice weapon, having a conventional handle piece with a lock for a drop barrel, with a trigger mechanism which optionally has a rotary bearing for a rotatable trigger, with a spring base on which the return spring is supported; and with a practice breech with a fixed practice barrel. In order to permit a conversion without the use of a tool, an adapter is inserted into the handle piece, the adapter being supported firstly above the trigger mechanism, optionally above the rotary bearing, on a brace and secondly in the upper region of the spring base of the handle piece. Furthermore, the upper region of the adapter has guides for the practice barrel, and the lock interacts with a locking carriage, which is formed in a locking slot of the adapter, in such a manner that the locking carriage secures the practice barrel.

A modular handgun system comprises an elongated universal trigger frame having a barrel locking block, a pair of slide rails, and an accessory rail. The trigger frame is adapted to have a trigger assembly mounted thereto. The system further comprises a grip frame having an elongated channel and a hand grip extending downwardly from the elongated channel. The trigger frame is removably mounted in the elongated channel of the grip frame. The accessory rail of the trigger frame is positioned forward of a forward end of the elongated channel of the grip frame so as to be exposed. The system further comprises a slide and barrel assembly slidably mounted on the slide rails of the trigger frame.

A firearm with tilting barrel-receiver assembly includes a frame and a barrel-receiver assembly pivotably mounted to the frame. The barrel-receiver assembly is movable between an open position and a closed position. A latching mechanism includes a latch that selectively engages the barrel-receiver assembly. The latching mechanism may be disposed in the frame in one embodiment. The latching mechanism is movable between a locked position wherein the barrel-receiver assembly is held in the closed position and an unlocked position wherein the barrel-receiver assembly is movable to the tilted open position. The latch may be spring biased into the locked position. The barrel-receiver assembly may be configured for complete removal from the pistol in some embodiments. An interlock mechanism formed by a movable safety may be provided which prevents the barrel-receiver assembly from being unlocked when the firearm is in a ready-to-fire condition.

A barrel bushing and retained bias assembly are provided for engaging a barrel of a firearm to accommodate relative longitudinal movement of the barrel bushing and the barrel. The barrel bushing includes a retaining channel for retaining the bias assembly, such that a portion of the bias assembly extends into a bore of the barrel bushing to contact and be partly compressed by the outside diameter of the barrel.

The invention relates to a self-loading-pistol which comprises a frame (1), on which is slidably mounted a slide (11) for reciprocating movement, through the front part of which passes a barrel (9), which is fixedly and non-movably mounted on the frame (1), whereby a recoil spring (25) of the slide (11) is mounted on the guide (26) arranged under the barrel and a mechanism for locking the slide (11) during the firing process is arranged in the front portion of the frame (1) under the barrel (9). The mechanism for locking the slide during shooting comprises a two-armed lever (16) arranged swingingly on the axis (17), on whose front arm a locking member (14) is mounted in a seat (18) and on whose rear arm the damping member (15) is mounted in a seat (19), as well as a two-armed locking spring (21), pushing the locking member (14) and the damping member (15) upwards towards their seats (18 and 19), the locking member (14) and the damping member (15) being situated in the path of the motion of the support plate (13) of the slide (11). When the trigger is pulled rearwards for shooting, it causes a lever (37) to block any pivotal movement of the two-armed lever (16) and to retain it in place with its front arm and seat (18) in the uppermost position. When the trigger is in its forward rest position, however, the pivotal movement of the two-armed lever (16) is not blocked, so that during manual retraction of the slide the front arm of the two-armed lever (16) together with the locking member (14) in seat (18) can be brought out of the path of the motion of the support plate (13) with little or no effort.

A modular handgun system comprises an elongated universal trigger frame having a barrel locking block, a pair of slide rails, and an accessory rail. The trigger frame is adapted to have a trigger assembly mounted thereto. The system further comprises a grip frame having an elongated channel and a hand grip extending downwardly from the elongated channel. The trigger frame is removably mounted in the elongated channel of the grip frame. The accessory rail of the trigger frame is positioned forward of a forward end of the elongated channel of the grip frame so as to be exposed. The system further comprises a slide and barrel assembly slidably mounted on the slide rails of the trigger frame.

A frame lug, firearm and method for retrofitting a firearm having a receiver or barrel hingedly mounted to a frame. The frame lug is removed from the frame. A vertical bore having a threaded internal surface is machined at least partially into a main body of the frame lug. A tension post having a threaded external surface is fabricated and adjustably engaged with the threaded internal surface of the vertical bore to provide height adjustment of a top surface of the tension post above the main body. A horizontal bore having a threaded internal surface is machined through a side surface of the main body and operatively connected to the vertical bore. A lock screw having a threaded external surface is fabricated and adjustably engaged with the threaded internal surface of the horizontal bore to engage and lock the tension post in place.

A breech for a pistol including a barrel, which includes at least one barrel block and one chamber, as well as a slide and a breech guide, which is designed to move on a guide rail of a frame of the pistol and on which a socket having a breech face is formed. In order to increase the mechanical stability, the barrel block includes at least one recess on each side, which interacts with centering rails that are provided on the inside of the breech guide and are formed to be complementary to the recesses in terms of form and function.

A firearm with tilting barrel-receiver assembly includes a frame and a barrel-receiver assembly pivotably mounted to the frame. The barrel-receiver assembly is movable between an open position and a closed position. A latching mechanism includes a latch that selectively engages the barrel-receiver assembly. The latching mechanism may be disposed in the frame in one embodiment. The latching mechanism is movable between a locked position wherein the barrel-receiver assembly is held in the closed position and an unlocked position wherein the barrel-receiver assembly is movable to the tilted open position. The latch may be spring biased into the locked position. The barrel-receiver assembly may be configured for complete removal from the pistol in some embodiments. An interlock mechanism formed by a movable safety may be provided which prevents the barrel-receiver assembly from being unlocked when the firearm is in a ready-to-fire condition.