In Grand Theft Auto: Liberty City Stories there are many type of weapons the player can obtain while playing the game. Most of the weapons in the game have been taken from Vice City; however there are some new weapons to choose from. Unlike Grand Theft Auto: San Andreas you cannot duel-wield weapons at the same time, however there are a greater number of weapons than were present in San Andreas. Some new weapons that appear in the game are: the hockey stick, a chisel, a Glock 17, and the classic fire axe. Some weapons have been slightly remodeled from the Vice City arsenal such as the Chrome Shotgun now has a longer under-tube, and on a higher scale the MP5 has now changed to a MP5K. A great returning weapon is the SPAS 12, and as in Grand Theft Auto: Vice City, can fire in fully automatic mode, with a noticeable slower rate of fire. It is also the hardest weapon to find on the game. The sounds from the weapons have not been changed and are all from Vice City, with the exception of grenades which has a softer explosion.
Ammu-Nation gun shops returns, selling you weapons that they have in stock. A new addition to the GTA III Erais Phil Cassidy's Fully Cocked Gun Shop where the player can purchase heavy weaponry, with the same convenience as an Ammu-Nation store.