Editing MAC-10 (section)

===Calibers and variants===
While the original M10 was available chambered for either .45 ACP or 9mm, the M10 is part of a series of machine pistols, the others being the MAC-11/M-11A1, which is a scaled-down version of the M10 chambered in .380 ACP (9×17mm); and the M-11/9, which is a modified version of the M-11 with a longer receiver chambered in 9×19mm, later made by SWD (Sylvia and Wayne Daniel), [[Cobray Company|Leinad]] and Vulcan Armament. Law enforcement bureaucracies such as the [[Minnesota Bureau of Criminal Apprehension]] (BCA) consider MAC-11 variants such as the Leinad PM-11 to be part of the "MAC-10 class pistol".<ref>{{cite news |first1=Lou |last1=Raguse |title=New warrants in Idd's case reveal car search and investigation of possible link to brother's case |url=https://www.msn.com/en-us/news/crime/new-warrants-in-idds-case-reveal-car-search-and-investigation-of-possible-link-to-brothers-case/ar-BB1cJoAX |access-date=14 January 2021 |work=MSN News |agency=Kare 11 |date=14 January 2021 |archive-url=https://archive.today/20210114073440/https://www.msn.com/en-us/news/crime/new-warrants-in-idds-case-reveal-car-search-and-investigation-of-possible-link-to-brothers-case/ar-BB1cJoAX |archive-date=14 January 2021 |quote=And they found a backpack on the passenger side that had ammunition and "Leinad PM-11 high capacity pistol." The BCA calls it "a MAC-10 class pistol," |url-status=dead }}</ref>

In the United States, machine guns are [[National Firearms Act]] items. As the Military Armament Corporation was in bankruptcy, a large number of incomplete sheet metal frame flats were given serial numbers and then bought by a new company, RPB Industries. Some of the previously completed guns, which were already stamped with MAC, were then stamped with RPB on the reverse side, making it a "double stamp" gun.{{citation needed|date=November 2022}}

RPB Industries made many open-bolt semi-automatic and sub-machine guns before the [[Bureau of Alcohol, Tobacco, Firearms and Explosives]] (BATFE) seized roughly 200 open-bolt semi-autos during the drug wars of 1981.<ref>https://www.firearmsnews.com/editorial/m10-full-auto-for-sale-rare/491652</ref> The BATFE insisted that all future semi-automatic firearms were to be manufactured with a closed-bolt design as the open-bolt semi-automatics were considered too easy to illegally convert to full automatic operation.<ref name="Walker2012"/>

A semi-automatic variant, the MkIII/IV/V was marketed to South American countries where "military" calibers were forbidden for civilian sales were chambered in .30/.41/.50 Ingram and available as semi-automatic pistols/carbines.<ref>https://werewolf0001.livejournal.com/717328.html</ref><ref>https://www.reddit.com/r/ForgottenWeapons/comments/wk42zb/does_anybody_have_any_information_on_this_ive/</ref>{{citation needed|date=April 2025}}

Wayne Daniel, a former RPB machine operator, purchased much of their remaining inventory and formed SWD, designing a new weapon which was more balanced, available either fully or semi-automatic with his new BATFE-approved closed bolt design.<ref name="Larson2011">{{cite book|last=Larson|first=Erik|author-link=Erik Larson (author)|title=Lethal Passage: The Story of a Gun|url=https://books.google.com/books?id=FzV82AD3GlQC&pg=PA253|date=27 July 2011|publisher=Knopf Doubleday Publishing Group|isbn=978-0-307-80331-3|page=253}}</ref>

There are several carbine versions of the M-11/9 and Cobray and SWD manufactured a smaller version chambered in .380 ACP as a semiautomatic pistol called the M-12.<ref name="Shideler2011">{{cite book|last=Shideler|first=Dan|title=Gun Digest 2012|url=https://books.google.com/books?id=HEjWeu2XJlEC&pg=PA54|year=2011|publisher=Gun Digest Books|location=Iola, Wisconsin|isbn=978-1-4402-1447-9|page=54}}</ref>

Today, while the civilian manufacture, sale and possession of post-1986 select-fire MAC-10 and variants is prohibited, it is still legal to sell templates, tooling and manuals to complete such conversions. These items are typically marketed as being "post-sample" materials for use by Federal Firearm Licensees for manufacturing/distributing select-fire variants of the MAC-10 to law enforcement, military and overseas customers.<ref>{{cite web | url = http://www.fullautoguns.com | title = Select-Fire (Fully Automatic) conversion information | access-date = 2020-10-07 | archive-date = 2015-06-20 | archive-url = https://web.archive.org/web/20150620123116/http://www.fullautoguns.com/ | url-status = dead }}</ref>