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The early characteristics of the new cartridge were;. Bullet weight: grains. Charge weight: Primer: Winchester No. Pressure: 31, PSI e. Muzzle velocity 1, feet per second. The cartridge was approved as Standard on 30 September The original configuration of the. The original. A new flat base grain projectile was designed to eliminate the problem. The type of powder used in carbine cartridge was also changed. The original DuPont powder proved to be too bulky for the small case.
To achieve a higher projectile velocity a new DuPont powder was introduced. Bullet weight; grains b. Charge: DuPont or Hercules Primer: commercial non-corrosive d. Pressure: 40, PSI e. In September of , the nomenclature of the. The loose rounds in the photo are modern soft-points. Close up of the barrel delay spring and pin.
For reference: the barrel delay pin is. The spring dimensions are: outside diameter. The barrel at the top of the photo is from an early manufacture pistol featuring a locking lug.
The Automag pistol is rather large with an overall length of Left: View of the firing pin and hammer with the safety in the OFF position.
Right: View of the firing pin and hammer with the safety ON. With the safety engaged, the hammer is blocked from contacting the firing pin. Field stripping the Automag III is similar to the pistol. Remove the magazine and visibly check the chamber to ensure it is not loaded. Retract the slide far enough to push out the slide stop, and pull it out of the frame. To remove the barrel from the slide, depress the recoil rod bushing and rotate the barrel bushing until it clears the rod bushing.
Remove the recoil rod, being careful to keep the barrel delay spring and pin from becoming lost. Remove the barrel through the front of the slide. No further disassembly is needed or recommended. Origins of the. Cartridge, Carbine, Caliber. The early characteristics of the new cartridge were; a. During , the. The focus of this article is on the Irwindale Arms Inc.
The first semi-automatic pistol chambered for the. Kimball Arms Company of Detroit, Michigan. The Kimball went into series production in Only a few hundred. The first known public advertisement for the. Also featured in the article was the Irwindale Arms Inc. Javelina in 10mm, which was similar in appearance. Both pistols were marked with the IAI logo and Irwindale address. During the Automag III was placed in series production.
The pistol is made of a stainless steel, with the exception of the barrel, which is stainless, and the A-2 tool steel sear. The major components including the slide and frame are investment castings. The stainless steel has a bead-blasted matte appearance with the exception of the sides of the slide, which are polished. The grips are made of a black composite material.
The slide mounted safety is a simple rotating cylinder that blocks the hammer from contacting the firing pin. The pistol can be placed on safe even if the hammer is not cocked, the safety does not lock the sear or trigger. A cocked hammer will fall by pulling the trigger when the safety is applied, but the safety will block the hammer from striking the firing pin.
The slide stop is on the left side of the frame, it locks the slide back after the last shot has been fired from the magazine. The magazine release button is located on the left side of the frame just aft of the trigger. The single-stack, single-feed magazine holds 8 rounds. The rear sight is a Millet adjustable; the front sight is a fixed ramp. The trigger pull measured 4. The Automag III is similar in appearance to the classic pistol, albeit larger in size.
The grip is somewhat wide, measuring 2. The unloaded weight of the Automag III is 45 ounces, overall length is Field stripping procedures are very similar to the pistol. An interesting design feature is the spring-loaded pin assembly that protrudes out of the rear of the recoil spring guide rod.
The purpose of the pin is to delay the barrel in order to prevent it from jamming on the slide as it moves forward. It should be mentioned that when field stripping the pistol, special attention should be paid to the, easily lost, spring and pin.
There are different configurations of the Automag III pistol, which was manufactured under different company logos. Due to the small number of examples available to examine it is not possible to pin point exactly when certain features appeared or were deleted. The earliest Automag III pistols in. Known examples have a locking lug on the barrel and corresponding locking groove in the slide.
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