I want to build an operational AR-class lower from an 80% blank. This wouldn’t be on the list, so that’s legal, isn’t it?
No, no, no! Walk away from this – there’s too much chance this may not be legal. At best, it’s a murky situation. The Harrott decision indeed protects off-list AR and AK series receivers. The problem is that there’s really no practicable way that homebuilt AR and AK receivers could ever be listed individually by “make and model”, and thus these may fall out from the scope of Harrott: the Harrott decision, after all, was all about practicality and uniformity. If these receivers are not Harrott-protected, there’s a chance they could fall back under Kasler, making possession of such receivers a felony. For now, you should only acquire off-list AR and/or AK series receivers from normal commercial production.
