Quote Originally Posted by HCM View Post
Re # 5 - many run only the front BUIS up on carbines, the idea being if the dot dies the front sight post can be used in conjunction with the optic window /body acting as a rear close up. The thought being at greater distance there would likely be time to flip up the rear BUIS.

Of course on a secondary sighting system doesnít need to be irons, though itís still the most practical choice on a pistol. A red optic and a green laser can be viable.
I understand your point, and that is how I run my carbine-a fixed front sight, rear folded down. It seems this might be personal preference, although that is sometimes not respected these days.
A Streamlight TLR8 w/green laser is attached to my personal 19 MOS. Iíve worked with it in reduced light, and I think it quite viable.