AMT AutoMag II
{{Use dmy dates|date=July 2020}}
{{Infobox weapon
| name = AMT AutoMag II
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| origin = United States
| type = Semi-automatic pistol
| is_ranged = yes
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| manufacturer = Arcadia Machine and Tool
| unit_cost = $406 MSRP
| production_date = 1987–1999
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| weight = {{convert|32|oz|abbr=on}}
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| part_length = {{convert|6|in|mm|abbr=on}},
{{convert|4.5|in|mm|abbr=on}},
{{convert|3.375|in|mm|abbr=on}} (Compact Model)
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| cartridge = .22 Winchester Magnum Rimfire
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| feed = 9 round detachable magazine (Full-size Model)
7 round detachable magazine (Compact Model)
| sights = White outline Millet adjustable sights (until late 1993)
Adjustable 3 dot system (since late 1993){{cite book|last1=Fjestad|first1=S.P.|title=Blue Book of Gun Values|url=https://archive.org/details/bluebookofgunval00spfj|url-access=registration|date=1997|publisher=Blue Book Publications|location=Minneapolis, MN|isbn=1-886768-08-0|page=[https://archive.org/details/bluebookofgunval00spfj/page/99 99]|edition=18th}}
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The AMT AutoMag II is a semiautomatic handgun chambered in .22 WMR, that was manufactured by Arcadia Machine and Tool from 1987 until 1999,{{cite book|author1=Dan Shideler|author2=Jerry Lee|title=2012 Standard Catalog of Firearms: The Collector's Price & Reference Guide|url=https://books.google.com/books?id=gZDamMrZHs0C&pg=PA50|date= 2012|publisher=Krause Publications|location=Iola Wisconsin|isbn=978-1-4402-1688-6|pages=50–51}} and was manufactured by High Standard until their closure in 2018.{{cite web|url=http://www.highstandard.com/index.php/amt-firearms/amt-22-wmr|title=Model AMT-AutoMag II|year=2014}}
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.{{cite book|last=Holloway|first=Thomas|title=A Guide to Handgun Cartridges|date=2 April 2015|publisher=Barnes & Noble|location=New York|isbn=978-1-329-00762-8|pages=41–44}}
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.
See also
- AMT AutoMag III
- AMT AutoMag IV
- AMT AutoMag V
- Kel-Tec PMR-30: .22 magnum semiauto pistol
https://www.smith-wesson.com/product/mp-22-mag
References
{{reflist}}
External links
- [http://www.highstandard.com/ High Standard Firearms] {{Webarchive|url=https://web.archive.org/web/20180503105009/https://highstandard.com/ |date=3 May 2018 }}
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Category:AMT semi-automatic pistols
Category:Semi-auto magnum pistols