What is the case with the following items:

60rd Mags M4
Double Mags M4

They are literally removed since ca. 2 updates?? But it was not noted in any Patch notes?!

Or is it really because they are so many dupers that these items dont spawn anymore.

Maybe also 1 idea: Make updates so that they are NOT coming any new glitch and Dupe possibilities into the game. And maybe you should look to take offline all These dupe Videos on YouTube?!