The Firefly is, first and foremost, a facilitator of up close point shooting in daylight or darkness. As firefly experience accumulates, it’s clear how best to use them. The basis of this opinion is centered in the “five legs”, so to speak, of the great majority of law enforcement or civilian tactical experiences. These five legs, though reported by others, are based on much personal research, mostly through consultation with those in the position to qualify as experts. Those individuals have been SWAT personnel and SWAT leaders, one of the original founders of SWAT in America, and some special forces field experiences, etc., etc. All have impressive real world tactical resumes and, interestingly, have all come to similar deductions. Rather than just personal opinions and experiences, I was so much more interested in similarity of conclusions.
Those five legs are: 1) tactical situations unfold in the blink of an eye; 2) they happen at very close range; 3) they involve very few shots; 4) they happen in less than optimal lighting (not darkness); 5) all participants are likely to be moving.
Shooting for most is recreational and few equip or practice for those above five legs of the great majority of tactical realities. Most tactical situations do not occur in darkness, but rather in limited ambient lighting where the standard ATS florescent color combinations or the rear insert with firefly front are often relevant. When it gets to the truly darkened tactical situations, very rare as they may be, and where the assaulter is no more than a hardly, if at all, recognizable shadow, that shadow will be at arm’s length or not much beyond. Therein lies the true purpose of the firefly. The firefly, more than anything, is a great facilitator in point shooting, because it has the biggest glowing front sight in the industry and, therefore, the easiest to orient toward the threat under stress. The body chemistries that produce stress shape every experience, from vision, peripheral vision, balance, movement, and reaction time. The firefly makes it easier to moderate stress reactions in those up-close situations, by providing a visually large and straightforward method of engagement -- cover target with big glow and go. Of course, in dim light, the florescent white, yellow, and green rear sight inserts will provide a visible pyramid with a glowing top, for precise shooting at distance.
Allen, an occasional Facebook commenter, came up with the idea of a white rear insert with a green firefly. I had never thought of that one before. You can really see the whole pyramid with that white/green firefly combo in very low light -- a white mountain with a blue-green top. Much thanks and kudos to Paul, for providing the well-photographed fireflies in darkness. One can still notice the dimly lit florescent rear sight insert, even at that level of darkness.