it seems to me that the phaser pistols were still in the expermental stage at this time,that is why we see spock with the cage era laser gun still in use by starfleet.it would appear perhaps that the new phaser one-two model was equel in power and range to the phaser rifle kirk used.maybe thats why we never seen the phaser rifle anymore.this would mean that the phaser pistols were new issue by the time of corbamite".we also see dr crater and korby using the old lasers in ereas of limited contact.not the new phasers.of course we did see new rifles years later in tng.possible?