So, I just had a bare AR-15 receiver come in. As I understand it, this is logged as a "Receiver" and transferred as such. However, there is no caliber listed. It simply says "Multi". I have a call into Portland ATF, but was curious if anyone knows of a relevant guidelines, I'd value the link. I'm headed into "Brain Dead Meeting Number II" in my day job, so can't google it now, but I know there are other FFLs on board. I'll circle back in a bit. Thanks.