Beta Weapons are weapons that were removed from a GTA game during its development. It also includes some weapons that didn't make it to the final game and weapons have their models changed, and some still exist in the game files. Many made well during development and it is unknown why they were removed. However, most of them can be obtained through cheat device and trainers.
Grand Theft Auto 2
GTA Vice City
GTA San Andreas
The Skateboard was cut from the PC version. It is primarily a melee weapon but also a vehicle. Available as a mod for the PC version but is not usable on the PS2 version.
The Micro SMG known from GTA VC was also removed, but can be seen in several early screenshots.
The PSG-1, MP5-K, M16, M-60, M249, M47 Dragon, M82 and Nail Bat were cut. Models of the weapons can be found in the game files but lack textures, and some files remain on the PS2 version of the game.
There was going to be a camo version of the M4 but was cut. It can be seen during the mission Stowaway.
The MAC-10 was meant to reappear but was cut instead.
The Barrel was cut from the main game.
GTA Liberty City Stories
GTA Vice City Stories
The tear gas and landmines were going to be included in the game. However, they can be obtained with cheatdevice.
The phone was cut and replaced with a pager. In the PSP version, it's possible to take the phone out with cheat devices, but it's useless. But can be seen only in cutscenes.
The Advanced Rifle was more correctly modeled after a CTAR-21.
As seen in some artwork, the M4 was originally going to make an appearance, possibly the original Carbine Rifle, but instead was cut and replaced by the current model.
A Glock 17 can be seen in some artwork, usually wielded by Franklin, maybe the original Pistol design, but was replaced by a PT92 instead.
In "The Trunk" artwork, Michael can be seen wielding an M1911. Possibly the original Combat Pistol.
A SIG Sauer P226 can be seen.