From H.R. 138:
‘‘A large capacity ammunition feeding device manufac14
tured after the date of the enactment of this sentence shall
15 be identified by a serial number that clearly shows that
16 the device was manufactured after such date of enactment,
17 and such other identification as the Attorney General may
18 by regulation prescribe.’’.
I guess any magazine manufactured after such a date without a serial number will be assumed to be legally made prior to the enactment date?