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The SITES Spectre M4, a subgun in 9mm Luger, though it operates on just regular blowback, it actually fires from a closed bolt with a striker (or striker-ish) thing. This here is a semi-auto one imported to the US as a pistol, then had its original subgun stock and vertical foregrip (both rare in the US) added to it after being registered as a short-barreled rifle.
This gun has quite a lot of odd features to it, and in construction it's kind of odd itself, being made from a particularly thick gauge of sheet steel (though it's robust as a result). One of the things this weird gun lets you do is to, I don't know how to describe it, "semi-decock" it, and putting it into a pseudo double-action/single-action mode, only it's not actually double-action, and it's more sort of like a Glock's quasi-double-action where it needs to be partially cocked first. I don't really know how to put the mechanics of it into words.
The other feature which it's most famous for (besides its cool looks), is the quad-stack magazines, where two double stacks of cartridges sit side by side, then converge at the top into one double stack (with a two position feed), allowing it to fit a decent bit more ammunition for the given length. At a length comparable to a typical double-stacked 20rd magazine, the Spectre's can fit 30rds, and that's the short one, but for one which is about the length of a typical 30rd magazine, it fits 50rds. As cool as this gun is, apparently the magazines are the bothersome part, described by many as very bothersome to load, and usually they go for well north of $100 by their own.
SITES was hoping that they would be able to sell this gun to Italian law enforcement, but found that they weren't particularly interested, as spaghetti cops had been using Beretta M12 subguns for many years, and found those to be very satisfactory guns. Why waste time and money on what's at best a sidegrade?