My situation: I have a unit of 10 Grey Knights. One of whom is a Justicar, and as such can, according to the codex be given equipment from the armoury. There's nothing saying regular GKs can. If I give frag grenades to the Justicar, does the whole squad benefit from them? If not, apart from mounting them in a Land Raider Crusader, how can the squad benefit from frag grenades, if at all?