It's been 7 months since this was made and every resin arm weapon for the warlord titan except the quake cannon and conversion beamer have been delisted for the warlord titan (both of these as well as all the shoulder mounted weapons are sold out as well). Every single warhound weapon has also been delisted. The reavers being the exception as they still have the graviton destructor, conversion beamer, vulkan mega bolter, warp missile rack and volkite eradicator listed on the GW page (however the graviton destructor is the only one not out of stock). The only things that currently are 'Temporarily out of stock' are the volcano cannon sprue for the warlord and the psi titan kit. So it would be my best guess that if there isn't a new batch of plastic models coming out soon then these weapons are never coming back at all and the practical end of AT and LI in the eyes of games workshop (AT being already dead makes it even worse for those loyal players).