So, someone got a reply back from the ATF before I did.

As I had said in a few threads, shouldering the arm braces, does NOT change its classification as it does not change its INTENDED DESIGN.

The FTB of the ATF loves that word.

ATF Letter:


So, one with a small TOLD YOU SO. Followed up with a couple of .

I have modified the letter so it fits on one page, so you can print it and stuff it in your range bag if you run into an... idiot special friend.


Now, that all said, if you change/redesign it with the INTENDED FEATURE of shouldering it, yours becomes a stock. So no filling the hole in with stuff.

On the one hand, I'm kind of annoyed that someone would even ask them, but on the other hand maybe this will finally shut the "shouldering it makes it an SBR!!!" guys up.

I always shouldered my AR pistols anyway. Guess I'm a rebel. LOL.

Good info , thank you !

Now we wait for states like CA to enact a rule change to make it illegal in their state. lol

This should put a few of the abysmally ridiculous threads, and hopefully puts a lid on the people that think they know everything about the intent and design.

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Nah, you just are not "special".

Too bad those things are so damn ugly.

Fair warning, root . . . I'm gonna kiss you on the lips the next time I see you.

Attached is another version of the letter. It's three pages rather than one, your choice which one you want. This mofo is getting printed and put in my range bag, for damned sure!

By looking at his avatar... MadPick may slip you the cow tongue for sure! Lol


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Thanks guys for posting this. In writing is always better.

this part is very important... the brace as designed and manufactured is considered a brace...

modifying it in any way other than what the manufacturer sold it as and designed it to be installed, even as simple as adding a filler or a spacer or any other item that changes the original design/application including trying to move it back so it sticks out rearwards more than normal, can be construed as you modifying the part and therefore you are now the manufacturer of a redesigned/modified part that is based off the original item...

therefore at that point, it is your intent that then can be used as a basis of the weapons classification... the brace has been clearly shown as an item intended as a brace, therefore since sig/century declares it to be that, and it is sold with the clear intent to be used as a brace, then the ATF used that intent/design appication as the basis...


basically, modify the brace, get caught using it as a stock , and you as the manufacturer can no longer hide behind an ATF letter that was based on the unmodified item...

anybody here want to write the ATF and ask an opinion on making the M92 with the brace into a firearm by adding a VFG?
I'm not really sure how to go about doing that..

I'm guessing the same logic applies if you were to use it to hit a golf ball it would not be reclassified as a putter.....

Well, are you welding a muzzle device on it to ensure you are at 26" or better?