Feds admit in court that AR-15's are not weapons of war

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(3) Accessories or attachments specifically designed to automatically stabilize aim (other than gun rests) or for automatic targeting, and specifically designed parts and components therefor.

Wouldn't the recoil comps, bipods, and certain optics fall into this category?

It looks to me like bipods would be excluded for being gun rests.
Compensators do not stabilize aiming, so would also be excluded.
Certain optics would definitely fall into the category. For instance:

[video=youtube;yGh1jB2ffiI]https://www.youtube.com/watch?v=yGh1jB2ffiI[/video]