How many of the the 922r parts are in an AR?
To help with the counting here's the list:
For purposes of this section, the term imported parts are:(1) Frames, receivers, receiver castings, forgings or stampings
(3) Barrel extensions
(4) Mounting blocks (trunions)
(5) Muzzle attachments
(7) Bolt carriers
(8) Operating rods
(9) Gas pistons
(10) Trigger housings
(16) Pistol grips
(17) Forearms, hand guards
(18) Magazine bodies
(20) Floor plates
To make it a little more interesting I'd like to see what you think about the "trigger housing". Does that mean the part that surrounds the exposed part of the trigger? If it does if you're using a new style billet lower with the "trigger guard" machined as a completely closed part of the frame does that mean it no longer has a separate "trigger housing"?
Here are a couple of pictures of milspec and billet lowers for review.
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