What rifle is this?

[99HMC4]

On page 8 of the Trijicon catalog, theres three guys next to a blackhawk. What rifle is that in the middle? :confused:

[caelumatra]

Looks to me like an m16a2 with an acog on top of the carry handle. But looks like a longer than the normal 20" barrel and definitely non standard fore-end

[sadmin]

RR 24" varmint with detach carry handle & triple tap. :p
just kidding of course; strange butt-stock as well, reminds me of a saw stock a little.