The Phaser 2(B)
introduced during 2285 introduced as a standard sidearm to replace
the 2271 model P2, which was still in use during the early deployment
of the Phaser 2(B) during 2285. Like the Original Phaser 2, the
Phaser 1 was docked to the top, for it's P2 configuration. Assumably
the Enterprise 1701 stocked Both the P2A and the P2B in it's armory.