When combat is up and close, as an example, and you need to put a combatant down before they will get in shut more than enough that has a knife or other weapon. The BFSIII B&T-C1 is explicitly created for the B&T APC9 and helps the shooter spot many rounds https://collinqldzo.blogs100.com/33410893/details-fiction-and-binary-trigger-glock-19