EDIT: Converted to ZIP file, should be much more easy to download now.

TL:DR; converted I am not a spy...'s mod PDTH Sentry Gun from the pdmod format to mod_overrides.

Put it in mod_overrides (PAYDAY 2\assets\mod_overrides)

SuperBLT and Beardlib are required for most mods, but correct me about their uses.

BeardLib https://modworkshop.net/mod/14924
SuperBLT https://superblt.znix.xyz/

Known Bugs:

1.) When playing on multiplayer, picking up a suppressed sentry will cause the suppressor to remain still in place and will repeat the same process with a (theoretically) limitless amount of times. This bug seems to happen to most sentry mods I've encountered so I do not know how to resolve this.

If you find any more bugs let me know! And also please put in a crash log!

Credits:

I am not a spy... - for the base pdmod file
Overkill Software - for sentry gun model, textures, etc.
Me - for compiling everything else.
Cpone - for suppressor/silencer model from his Old Briefcase Sentry mod, used for the suppressed variant of the sentry gun.