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Apply the Pro Reo Principle (Rule of Lenity) to determine whether the accused should be convicted on the illegal possession of a firearm without license charge under Republic Act No. 10591, given the following facts: Police recover a gun-shaped device consisting of a polymer frame, a barrel, and a slide, but the firing mechanism and propellant are missing. The exterior resembles a pistol. The Firearms and Ammunition Regulation Board has not yet classified the device. The defense argues that because the firing mechanism and propellant are absent, the device cannot expel a projectile and is therefore not a firearm. The prosecution contends that the statute covers devices that could be assembled into a functioning firearm, so possession of the device falls within the statute’s scope. The language thus raises ambiguity as to whether possession of this device constitutes possession of a firearm. State, with brief justification, whether the accused should be convicted or acquitted on the firearm charge, and briefly state any allowable alternatives if applicable.