The 20th anniversary update added the fully functional Stun Stick from HL2DM to HL2, despite it not being merged into it like the Episodes and Lost Coast, which could imply that HL2DM was planned to be merged or is going to be. You can get it by enabling cheats and using the command "give weapon_stunstick_player".
There whole bunch of MP commands also, and even if you did not HL2DM installed, it have bin folder from it in folder of HL2. So maybe they still doing it
One can only hope...
pretty sure those commands were there, even before the anniversary update
this isnt the same stunstick entity thats from hl2dm, hl2dm uses regular weapon_stunstick, also the model in screenshots isnt even the one that is in hl2's files, im assuming you just downloaded that 1 mod from the workshop that also changes the model into the hl2dm one
I wish they would add some guns that are in files to the game. So pretty much Alyx gun and stunstick