Sure bud...It's the new B5 Polymer Keymod Rail (coyote brown). I picked up a pair a couple of weeks ago and this was my first outing with them. Before, I had used some COLT CAR hanguards with a bolt on light rail.
The B5 KR is much more slender and the ergonomics are better than even the CAR HGs-IMO. At first, after installing them, I almost thought they were to narrow, but after I rigged them up with a section of bike inner tube, installed a Noveske 4-slot rail with my Inforce light and handled them a bit...well...the B5 really grew on me.
At home (dry-fire) and the range, in some odd shooting positions, I found the slenderness of the B5 HG really shined, as the carbine's wieldy-ness (not a word) was excellent with strained handholds. With the COLT CAR HGs, I found them wanting for control in the same positions.
So, first impression of them is great, very comfortable-more so with the inner tube, they seem really strong and the Noveske rail/light locks up solid (added a little blue Loctite). I won't be switching back to the COLT CAR HGs anytime soon.

