Abstract: A readily replaceable bolt face for a firearm (10) with a movable slide (12) that strips a round from a magazine, extracts the spent round from the firing chamber and then ejects the round from the firearm by means of an ejector. A bolt face insert (32) has an external configuration that is common to a range of calibers, but with a bolt face side (66) designed to fit the rim of a specific caliber or calibers having the same rim dimension. The insert may be replaced to fit a different caliber without replacing the slide. The bolt face insert is provided with a slot (62) for the ejector and a groove (60) to accept an extractor for the specified caliber.

Abstract: Double action, hammer trigger mechanism for a semi-automatic firearm (10) with a spring loaded slide (12) having a cam surface (28), a pivoting sear (46) to hold the hammer (20) in a cocked position and a transfer bar (26) connected to a pivot pin (54) on the trigger (24). The transfer bar has a cam finger (30) to move the transfer bar down when the slide moves in a rearward direction during firing. When the sear is holding the hammer cocked, a second finger (62) on the transfer bar is arranged to engage a single action let-off pin (56) on the sear and pivot the sear when the trigger is pulled so as to release the hammer. The cam finger also moves the transfer bar down when the slide is stationary and the trigger is operated. The transfer bar has a notch (60) receiving a double action let-off pin (58) on the hammer to cause the transfer bar to pivot the hammer in a cocking direction as the trigger is pulled.

Abstract: Frame construction for a firearm (10) with a frame (18) and a slide (12) constrained to move longitudinally between a forward and a rearward position but which is also removable from the frame. A recess (39) in the side of the frame contains the Kammer trigger mechanism (26, 38) that is accessible through a side opening (40) in the frame. A thin side plate (42) drops over the side opening and is held at its side edges and bottom edge by flanges (50) an the side plate overlapping congruent grooves in the frame and is held in place an top by the slide. After removing the slide in the conventional manner, the side plate can be slide upwardly and removed using a finger cutout (48) in the side plate.

Abstract: A pistol having a frame including a grip portion defining a magazine well and a trigger guard portion forward of the magazine well. A magazine catch disposed within an opening which extends transversely through the frame is biased toward a magazine retaining position and generally restrained against lateral movement relative to the frame. The magazine catch is further supported on the frame for pivotal movement about either one of its ends and toward a magazine releasing position in response to forwardly directed force applied to the end of the said catch opposite said one end.

Abstract: A unit is disclosed for use in converting a blowback autoloading pistol, such as a U.S. caliber .45 model 1911, into a gas operated one with the unit being adapted for connection to the receiver of the blowback pistol after its barrel and slide are removed. The unit comprises a shroud, a barrel and a gas activated piston for operating the bolt and its lock. The hammer, constituting part of the firing mechanism carried by the receiver, cooperates with the firing pin of the conversion unit in the same way as it did with the firing pin of the autoloading pistol. Instead of being used to effect a conversion, the structure involved in the conversion unit can also be used in making a completely new gas operated pistol or other firearm.

Abstract: A metal golf club head is provided, by an investment casting process, having an accurately positioned weighting insert of heavy metal rigidly embedded in and surrounded by the principle metal of the head with the presence of the insert, if desired, being entirely or substantially undetectable from a visual inspection of the finished head.

Abstract: A pistol having barrel and a gas operating mechanism coaxially supported on the barrel for axial movement relative thereto and defining an annular gas chamber surrounding an associated portion of the barrel. The gas operating mechanism includes a piston supported for movement relative to the barrel and a regulator plunger disposed generally within the piston, biased toward the piston, and supported for movement relative to both the barrel and the piston. Gases of explosion enter the gas chamber through gas ports in the barrel to move the piston and thereby operate extracting, ejecting and cocking mechanisms. The plunger moves away from the piston in response to predetermined pressure within the chamber to increase the volume of the chamber and decrease pressure therein. The plunger may move to a position wherein gases of explosion are vented from the gas chamber to atmosphere.

Abstract: A gas operated firearm capable of at least semi-automatic operation, the firearm including a receiver having a barrel connected thereto, the barrel including a bore with a plurality of radially extending ports through the barrel from the bore. A breach bolt is mounted for reciprocation in the receiver and is adapted for abutting registration in a first position with the cartridge chamber, and includes a locking lug for maintaining the bolt in position abutting the cartridge, when the cartridge is in the chamber. A slide is mounted for reciprocation on the receiver and includes a camming surface which cooperates with the cam on the bolt for unlocking the bolt and effecting reciprocation of the bolt in the receiver upon the slide being drawn to the rear of the firearm.