Exactly how does the ATF know who owns such a weapon?
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It extends. While blades are legal, supposedly to brace your arm against the blade, this thing has some real estate on the back of it. I'm coming in cold here, but I would say they're calling this a stock because it can be 'easily' shouldered. I'll look and see what they have to say.
Is this the brace that telescopically extends? If it's the one I'm thinking of maybe that's what makes it proprietary.
Shouldering a brace is completely legal and acceptable.
What makes it proprietary is the extension arms interface with the receivers. Lots of pdw style braces use the same style of adjustment.
The actual letter is still sealed, some industry guys mention that it flirts with the maximum length of pull.
The blades on my pistols can't be adjustable. I had to put locktite on my knurled screw to be legal.
I can't keep up with them. At one time, it was to be permanently affixed, so I had to locktite the screw.