AMT AutoMag II

The AMT AutoMag II is a semiautomatic handgun chambered in .22 WMR, that was manufactured by Arcadia Machine and Tool from 1987 until 1999,[2] and is currently manufactured by High Standard.[3]

AMT AutoMag II
TypeSemi-automatic pistol
Place of originUnited States
Production history
ManufacturerArcadia Machine and Tool
Unit cost$406 MSRP
Produced1987
Specifications
Mass32 oz (910 g)
Barrel length6 in (150 mm),
4.5 in (110 mm),
3.375 in (85.7 mm) (Compact Model)
Cartridge.22 Winchester Magnum Rimfire
Barrels1
6 grooves, right hand twist
Feed system9 round detachable magazine
7 round detachable magazine (Compact Model)
SightsWhite outline Millet adjustable sights (until late 1993)
Adjustable 3 dot system (since late 1993)[1]

Design

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.[4]

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.

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See also

References
  1. Fjestad, S.P. (1997). Blue Book of Gun Values (18th ed.). Minneapolis, MN: Blue Book Publications. p. 99. ISBN 1-886768-08-0.
  2. Dan Shideler; Jerry Lee (2012). 2012 Standard Catalog of Firearms: The Collector's Price & Reference Guide. Iola Wisconsin: Krause Publications. pp. 50–51. ISBN 978-1-4402-1688-6.
  3. "Model AMT-AutoMag II". 2014.
  4. Holloway, Thomas (2 April 2015). A Guide to Handgun Cartridges. New York: Barnes & Noble. pp. 41–44. ISBN 978-1-329-00762-8.
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