My barret/spas doesn't work

Alright, so this has been a major impact on the way I play and is starting to get extremely irritating, so I'll to summarize this as best I can.

Often times when I attempt to combo with a barret/spas, I shoot one or the other. However, as soon as I shoot one and switch to the other, it makes an empty sound or a reloading sound. This occurs 9/10 times when I'm fighting and causes my barret spas to either be near impossible to do or hellishly slow. I know this combo does not affect all people, but it does affect some (including myself).

The one way I've figured out how to bypass this is to hold right click down while switching between barret and spas. Although this does produce a faster combo, it still is not nearly as fast as some of the combos people pull off who are not afflicted with this bug/glitch.

I ask if any staff or admin could contact me about this, as I have tried several ways to communicate with other people. I've ran this test several times, my guns fully loaded, tons of ammo, etc...

I've gone to practice servers and practiced this to much success. My combo is extremely quick with nothing to hold it back. I've heard that something was put into place to stop fastplacers and macros, but I don't use either one of those.

 

I've had several people tell me that the barret/spas works just fine though. I'm not quite sure how breaking guns is a good solution to fixing macros/fastplace.