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One of the particularly popular transferrable machine guns out there is the H&K auto sear. Since H&K grip and trigger assemblies are interchangeable between 9mm, 5.56mm, and 7.62x51mm guns (ie, MP5, HK33, and G3) a single registered full-auto grip assembly can allow someone to effectively have three machine guns for the price of one (albeit only one at a time). However, there are some potentially very expensive and dangerous pitfalls for someone acquiring one of these without a full understanding of the law and the technical details.
In short, an H&K upper receiver that has the ability to fit a factory full-auto grip assembly is considered a machine gun by ATF, just like an AR lower with the third pin hole drilled. If you have a registered standard factory full-auto grip, any gun it can attach to is also by definition a machine gun. Instead, the proper way to do this is to register a grip assembly that is modified to fit onto factory semiauto receivers. This sounds pedantic and strange – and it is – but it is a complex and tricky area of law and ATF rule making. If you are planning to put tens of thousands of dollars into a transferrable H&K, you really ought to have a clear understanding of these issues before you make a purchase!
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At Forgotten Weapons I think the most interesting guns out there are the most obscure ones. I try to search out experimental and prototype weapons and show you how they work, in addition to more conventional guns that you may not have heard of before. You’re much more likely to find a video on the Cei Rigotti or Webley-Fosbery here than an AR or Glock. So, do you want to learn about something new today? Then stick around!
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