Beta Weapons are weapons that were removed from a Grand Theft Auto 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, some of them can be obtained through cheat device and trainers.
The Skateboard was cut from the PC version. It is primarily a melee weapon but also a vehicle.
The Micro SMG known from GTA VC was also removed, but can be seen in several early screenshots.
A Glock 17 can be found in cutscene.img under the name cs9mm. It is also featured during some cutscenes, most notably during the opening cutscene for the mission Ryder. Possibly hinting that it was left out by mistake.
The wrench, however returned in an update in online mode.
A sniper rifle resembling an SR-25/Mk 12 can be seen wielded by both Michael and Trevor during some artworks, also in the newer update files the cut SR-25/MK-12 Hybrid HUD and texture files could be found. It is named Assault Sniper in-game.
In a trailer, Trevor can be seen holding an Assault Rifle with a Laser Sight attachment. This was also seen in another screenshot where it is seen in use by a police helicopter sniper.
Some weapons had an older more realistic wood-cast model.
An Beretta 92FS/M9 Pistol was meant to appear but was probably replaced by the ongoing Taurus PT92.
One of the pistols (not confirmed which one) had the same shooting noise as the pistol from GTA IV, as Lamar is seen shooting one out of a car in Franklin's trailer. This may have been a placeholder.
The Rocket Launcher originally had an optional grip attachment, as seen in the official BradyGames Guide. It was taken out in the final game.
The Sawed-Off Shotgun had wooden grips.
Several of the weapons in the Beta much more resembled their real-life counterparts (i.e the Bullpup Shotgun resembled the KSG more clearly, and the Combat MG looked more like the FN Mk 48). This can be seen in the HUD icons for some of the weapons as well as the beta models of weapons such as the Assault SMG and Combat MG.
Some weapons such as the Assault SMG and Combat MG were originally modified from their TBoGT equivilents before being changed, whether to avoid copyright infringement or for creativity reasons.
An artwork for the High Life Update suggests that the Bullpup Rifle was originally modeled after the British L85A2 assault rifle. In the final version, it is based on the Chinese QBZ-95.
The Sword exists in the Grand Theft Auto V game files but it is not available and is unusable, as it has no actual code to function as a weapon. Only the graphics of it exist. It is possible to display it through hacking but it will not function and will be treated merely as if it was a clothing object. It was possibly that the sword was once a usable weapon in the beta version of the game, but was not implemented and got removed very early in development for unknown reasons.