[quote=@HeySeuss]
<Snipped quote by Foster>

Yeah, I understand. I was just being careful to point out that the BATF is kind of finicky about this right now thanks to 3D printing guns and so forth.
[/quote]

[url=http://www.ar15.com/forums/t_1_5/1032834_Remember_those_Airsoft_guns_seized_by_the_ATF_in_WA___UPDATE_.html]Pretty much it boils down to what the most gun-phobic person in BATF you'll encounter will think.[/url]

Surprisingly, the ATF in Waco, Texas is somewhat less overzealous.