Frag grenade

The frag grenade is a weapon and item in the Doom which is available in both single player and multiplayer games. While a conventional grenade based on the at the core, it has been enhanced by the UAC in several ways: a "Comp-D" explosive pack with steel alloy shell provides a 5 meter radius of lethal damage free of drop spots, a chemical fuse mechanism provides better reliability, a machined interior case yields higher projectile output, and a safety clip is provided for the trigger switch to prevent unintentional "pin pulling."

Tactical analysis
The frag grenade is available in both modes as a secondary form of attack in addition to the player's current weapon. In single-player mode, grenades are found as ammunition in the environment. In multiplayer, the frag grenade is one of the items which can be selected as part of the player's loadout during spawning. It can be thrown at virtually any time for instant blast damage over a small area. It is naturally best used in open areas or from a good vantage point on a restricted target, since bounce-back is always a possibility.