Originally posted by jester
As far as I know:
1) Any 50BMG upper half is not allowed to put on any OLL. The reason is, all OLLs became available after the end of year 2004, which is the deadline to acquire receivers for 50BMG. (Of course the receivers acuqired prior to the end of 2004 must be registered as 50BMG prior to the end of Apr 30, 2006.)
2) If you have any AW registered by 2000, it is legal to be used as 50BMG, no matter you register it as 50BMG by the end of Apr 30, 2006 or not.
3) 50 BMG upper itself is perfectly legal in CA. Just don't put it on incorrect lower receivers.

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