It's to dissuading dilettantes, or people who've played Call of Duty and want an M4orgery.
BTW, if you're caught with a 30 round magazine and don't legally possess an MSSA that it goes in, but instead have a non-restricted semi-auto, you could be committing an offense. Take a look at what some people have been charge with here:
Nicholas Taylor Barrister - Firearms Lawyer - Recent Cases - Nicholas Taylor Barrister - Firearms Lawyer
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