The comic book adaptation of Doom appears to depict the BFG 9000 as a heavy machine gun instead of a plasma weapon, since it fires a stream of small projectiles that resemble bullets instead of an expanding energy blast.A source port of the game, MBF, features a working reenactment of the early-version BFG seen in the beta. According to John Romero, the idea of the weapon firing the green and red plasma projectiles was scrapped because it 'looked like Christmas'. That was changed to the final, possibly more powerful version because the former could greatly slow the game down from the number of projectile sprites on screen. An early version of the BFG9000, known as the ' BFG 2704' in the Doom Bible, was originally capable of firing a deadly, rapid-fire spray of green and red plasma projectiles that can bounce off of ceilings and floors (spending 40 cells per shot), as if it were 'a Plasma gun that had gotten on steroids'.As with the rocket launcher and chaingun, the full BFG sprite (after pickup) is slightly too large for the screen, and can only be viewed with a level or resource editor the lower edge of the sprite includes a BFG logo.Flat images of parts of the same toy were used for some of the Tekwall textures. The original BFG was digitized from a RoarGun, a battery operated toy gun manufactured by Creatoy.
