I couldn't understand why there's a key to drop weapons in GTA Online but not in single player, especially since there was weapons that I did not want to carry anymore. Thankfully it is pretty easy to do with a script.
Press F9 (same key as GTA Online) to drop the weapon that you currently have equiped. You can change the key in the 'Configuration' section near the top of the WeaponDrop.lua file.
I believe I got most of the weapons. Let me know of any that I missed. Also let me know about any problems you find that are not in the 'known issues' section.
Pickup distance has been descreased, allowing weapons to be dropped closer to the player.
Place the WeaponDrop.lua file inside the \scripts\addins\ directory in your base GTAV install location.
For the pickups.meta files, pick which version you want from the OpenIV folder and then just follow the folder setup in the download to put them in the right place (it's hard to get specific here since all the files have the same name), just different locations. If you can't figure it out, maybe modding gta v is not for you...
Version 2.6 (04.23.16) - Added support for the 2 new weapons from the April 2016 patch - Temporary (hopefully) fix for crashing on loading.
Version 2.5 (12.20.15) - Added support for the 2 new weapons from the Executives and Other Criminals DLC
Version 2.4 (10.24.15) - Added support for the 2 new weapons from the Lowriders DLC - Added support for the flashlight from the Halloween DLC - Code Improvements
Version 2.3 (07.24.15) - Added support for 2 new weapons from Ill-Gotten Gains Part 2 - Code Improvements
Version 2.2 (06.12.15) - Added support for the Combat PDW from Ill-Gotten Gains update
Version 2.1 (06.06.15) - Slightly increased non weapon pickup distances - Minor code improvement
Version 2.0 (05.22.15) - Added dropping for baseball - Adds pickups for BZ Gas, Fire Extinguisher, Flare, Snowball, and Baseball - Decreases pick up range and moved weapon drops closer to player - Created optional pickup files without glow (Thanks Drkz [Enhanced Wallets]) - Minor code improvements
Version 1.1 (05.16.15) - Added animation when dropping - Dropped guns now retain clip ammo - Thrown weapons now drop one at a time - Fixed ammo issue with thrown weapons - Added dropping while in vehicles
Mods that replace any of the pickups.meta files. But you can probably merge conflicting mods together quite easily, especially if you use a program such as 'Beyond Compare'.
I *might* offer compatibility patches in the future for popular mods, or just mods that I end up using myself. No promises though.
There seems to be a limit of 105(?) pickup entries. After the April 2016 patch that added two new weapons, I found that the game would crash on loading unless I removed one entry from any pickup.meta file. It doesnt seem to matter which entry is removed or from which file. So This leads me to believe that there is a max number of entries set somewhere. As a work around until another solution is found, I have removed the baseball pickup data that this mod had added. So the baseball might be slightly bugged when trying to drop it.
Weapon Components are not saved, even though they will show on the dropped weapons (example: silencers)
Picking up a weapon gives you a clip worth of ammo in addition to what is in the clip already
The animation isnt perfect, especially since I could only find dropping animations for the left hand or both hands, oddly no right hand
Weapons dont always appear to be dropped outside vehicle windows, sometimes they go through the floor instead
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Download Weapon Drop v2.6 
