Ah yes, just a pack of some random guns made by Robotnik.👌

Submachine Guns:

• Rusty's Master Debater (Grease Gun)
• Rusty's Sprayer

Assault Rifles:

• Rusty's Widowmaker (CZ 858)
• Rusty's Vape-Master (M4A1 2018)

Designated Marksman Rifles:

• Rusty's Brain Scrambler (SCAR SV)

Special:

• Rusty's Wall of Death (Laser Cannon)
• Rusty's Hellfire (Railgun)

Robotnik (or his later name "Mac Tonight") suddenly deleted his own Steam account sometime around late 2022 and early 2023, taking all of his addon alongside with it.

Although some people have already reuploaded the Call of Duty SWEP packs, there are still a bunch of old addons being left out and suddenly gone without a trace.

Not sure why he made this decision, even if his addons are old and broken, it's still a great loss of addons we have.

Fortunately, they're back now, with the help of Cheetah's Gmod Archives, I was able to recover the original addons files.👌
https://gmod-archive.cheetah.cat/#/
(Even though with some issues here and there.)

You can still visit his Steam Group though:
https://steamcommunity.com/groups/justinseebecksweps

Please be noted that this addon as a reupload, which means I'm not the original creator of this addon, but rather just the one who reuploads it back onto the workshop so that others can continue to use and enjoy.

Credits :
Mac Tonight (Formerly Robotnik) - Original creator of the addon.
NeoLin - Reuploading the addon.