This is gonna sound silly, but I saw it on a re-run of SG-1 and it looked interesting.
oops i meant scope.
and an infared score stupid. and a non collapseable stock
It is a flat top M-4 with a front hand grip with Picatinny rail system on all 4 sides of the fore grip. They have mounted a vertical hand grip to the bottom rail and what looks like a flashlight on the right hand side.
the kind that shoots bullets. lol it looks kind of like an m16 with a cutoff barrell