This paper model is a Type 2 Phaser (or Phaser Pistol), a typical hand-held directed-energy phaser weapon used by Starfleet and United Federation of Planets personnel during the late-22nd, 23rd and 24th and the 29th century, based on American sci-fi entertainment franchise Star Trek, the paper model is created by Michael Haggard.
A descendant of the EM weapons and phase-pistols of the 22nd century, the type 2 phaser was introduced before the mid-23rd century and was standard issue aboard Starfleet vessels by the 2260s. In the nearly two hundred years since their introduction to Starfleet personnel, several models and makes have been observed.
Utilized primarily in defensive situations, the phaser type-2 had several applications, from use as a weapon to use as a cutting tool, explosive device, or energy source. Storing considerable energy, most phasers were distinguished by a roughly pistol or gun-type configuration, firing a focused energy discharge in the form of a beam or steady stream. [Source: wikia]
You can download this paper model template here: Star Trek: The Next Generation - Type 2 Phaser Free Papercraft Download [Box] [Gavitex] [Ge.tt]