I have to admit thats a logical use for FA Iv'e never used. Good ole Military teaches us to clear the weapon. FA is a last chance to chamber a round that is not completely in battery by design. Still a good use though. Thanks for the education.
Immediate Action Procedures (SPORTS)
If the weapon fails to fire:
S Slap upward on bottom of magazine to ensure magazine is fully seated
P Pull charging handle to rear
O Observe to see if a round or cartridge casing was ejected and chamber
and receiver area are clear (if chamber or receiver is not clear, proceed
to remedial action)
R Release charging handle (allow bolt to slam forward)
T Tap forward assist button to ensure bolt is fully forward
S Shoot