From Lexicanum

The Grey Knights Land Raider is essentially the same as the Space Marine Land Raider except it acts more like a mobile shrine, safe in the knowledge that they can prepare in utter safety before engaging the enemy. They are only ever deployed to the most dangerous and chaotic of places¹.

The Land Raider is armed with two twin-linked Lascannon sponsons and one hull mounted twin-linked Heavy Bolter. It can also be upgraded with Blessed, Dozer Blade, Extra Armour, Hunter-killer Missile, Pintle-mounted Storm Bolter, Psycannon Bolts, Sacred Hull, Searchlight and Smoke Launchers.¹

Sources

• ¹:Codex: Daemonhunters (3rd Edition)

Ordo Malleus Army List
HQ	Grey Knights Grand Master • Brother-Captain • Inquisitor Lord
Elites	Callidus Assassin • Culexus Assassin • Death Cult Assassin • Eversor Assassin • Daemonhost • Inquisitor • Grey Knights Terminator Squad • Vindicare Assassin
Troops	Grey Knights • Inquisitorial Storm Troopers Seconded Units: IG Armoured Fist Squad • IG Infantry Platoon • SM Tactical Squad • SM Scout Squad
Fast Attack	Grey Knight Teleport Squad Seconded Units: IG Rough Rider • IG Sentinel Squadron • SM Assault Squad • SM Bike Squad • SM Land Speeder Squadron
Heavy Support	Grey Knights Dreadnought • Grey Knights Land Raider • Grey Knights Land Raider Crusader • Grey Knights Purgation Squad • Orbital Strike Seconded Units: IG Leman Russ • SM Devastators • SM Dreadnought • SM Predator
Transport	Rhino • Chimera • Land Raider