January 2008 UTC FWIW The 30rd magazine wasn t a regular issue item in 1966 67 The straight 20rd mags were the standard issue then The Ichord Subcommittee fixated on the troops belief that the 20rd mags would not work well when loaded with more than 18rds Oh and I noticed that in his testimony before the Ichord Subcommittee Colt s Koni Ito cited the change to LSA as one of the three changes that would turn things around for the M16A1 The other two were the introduction of the new buffer and chrome plated chambers 13 49 22