Well I put the techniques to the test this weekend. The FAL passed and the Min 14 failed.
Whenever I would put a new mag in the gun, and pull the bolt back (while My left hand was on the mag), the bolt would close on an empty chamber. When my left hand pushes the mag forward, while the right hand charges the handle, the top bullet dunks down. This happened almost everytime.
I didn't have any jams while firing the gun but holding the gun like this during mag changes isn't a good idea. The FAL passed the test though. Even though its not a CQ gun.
This is a tip for ARs IMHO.
It does make you quicker though.