I have one of these up for sale, NIB. This is the weapon light system that replaces the standard forward grips of an AR carbine. In addition to the main light, there are two LED "navigation" lights that provide some illumination for movement, etc., without compromising your night eyes. I bought it a few months back, but decided to go a different route. It's never been installed on a weapon. It is a GREAT solution to a clean, integrated look that you desire for your carbine length AR.

It lists for $550 at most places, with Amazon listing it through some third parties at $450. I'll get it to APB members for $400 + shipping.