Type: Semiautomatic pistol
Produced: 1987-1999
Caliber: .22 Magnum (.22 WMR)
Action: Blowback
Trigger: Single action
Safety: Thumb safety/decocker (slide), magazine disconnector
Magazine: 9 rounds, box single
Sights: Rear, open sight adjustable, White Outline Millet Rear; Front, fixed, ramp shape
Grooves: 6 grooves, right-hand twist
Barrel length: 6" (152,5 mm)
Overall length: 9.25" (235 mm)
Muzzle energy: 214 ft-lb (290 J)
Muzzle velocity: 1,553 ft/s (473 m/s)

The AMT AutoMag II is a semiautomatic handgun chambered in .22 WMR (Winchester Magnum Rimfire), that was manufactured by AMT (Arcadia Machine and Tool) from 1987 until 1999, and is currently manufactured by High Standard.
There were a number of engineering challenges to overcome in designing an autoloading .22 WMR handgun such as extraction problems. The extraction problems stem from the fact that the slow burning rifle powder of the .22 WMR cartridge develops a late peak pressure. This can cause the case mouth to expand and jam in the chamber when fired from a handgun. AMT overcame this issue by drilling 18 holes at 90 degrees to the chamber. A sleeve was then welded over the chamber; providing a tiny amount of clearance for the excess gas to escape from the first set of holes on back to the second set, thereby relieving the pressure enough to prevent the case from sticking.
The stainless steel slide has a large cutout over the barrel, similar to the Beretta M9, to facilitate better cooling and ejection of the spent brass casing (more likely it is simply to reduce the moving mass of the slide to allow for the blow-back operation). The stainless steel construction throughout makes rust a non-issue.
Three models are made with varying lenght slides and barrels. The shortest pistol also has a cropped grip and a magazine capacity of 7 rounds. A number of larger caliber «Automag» pistols are also made with caliber up .50 Action Express.
Adjustable 3 dot system sight since late 1993.
Designed by Harry W. Sanford and Max Gera.

Credits:
Author's knowledge;
HOGG, Ian; ADAM, Rob - Jane's Guns Recognition Guide. Glasgow: HarperCollins Publishers, 1996. ISBN 0 00 4709799
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