Press checks are something that don't need to be done. Push and pull the magazine, cycle the charge handle and leave it alone. If you really must do an administrative(as in you're not firing for survival) press check, pull the magazine and ensure the top round has switched sides. This can and should be done visually, and physically(tactile) as the muscle memory of both methods will ensure you can successfully press check in both light and dark environments. Observing the chamber and f*cking with the FA afterwards does not confirm a chambered round and can lead to an unseated bolt. Removing the magazine has ZERO effect on the function of the rifle. If the magazine in question, is in fact in question. Discard it.
What I'm saying, is if you've loaded the rifle properly, and its properly lubricated, the FA is a wasted appendage. A failure to fire(type one stoppage) is rectified by your IA drill, which is TAP/TUG RACK. Not look into chamber(doesn't work in the dark) then play with the FA.
I've explained it above. If you missed it let me break it down short form.
IGNORE THE FORWARD ASSIST
Do tell, which professional school of instruction or "elite" unit teaches/preaches or uses the FA?
TDC