Greetings all! I'm new to the PTR 91 GI world. I just recently purchased this new rifle and have been learning its nomenclature and operation, reviewing the manual, etc. prior to shooting it the first time. I have noticed the manual does not cover something regarding this rifle's "Selector Switch." Clearly it has a selection marked "S" (for "Safe") and a selection marked "F" (for "Fire"), but there is a selection in between these two that is marked "E." The User Manual does not address this specific selection option. Can anyone provide an explanation? When the weapon is charged and the selector is placed in this "E" position, the rifle will fire if the trigger is pulled. Thanks for any advice or information anyone here can provide.