LF: Tyranid Carnifex Devourer Cannons

Hey all!
Picked up my first Tyranid model (Tyranid Hive Tyrant) and while talking to Pascal about the best possible weapon options for it he mentioned using Tyranid Carnifex Devourer Cannons (sp?)
Anyway, as a new WH 40K player I do not have the bits to make this conversion and was wondering if anyone in the community had a couple lying around they would be willing to sell to a new player.

Best Regard,
Jamie

there are a few options people use.
the default tyrant kit should have one set of the arms, maybe two http://1.bp.blogspot.com/-nDCMEtk_knk/UxX_rEI99YI/AAAAAAAAKOw/db4HMhj3bWo/s1600/su+march+4+028.JPG
if your looking for devourer arms with 3 barrels i've got lots of spare devourers from gaunts (the barrels are the same size)
another option some use is  the tyranofex fleshborer hive arms. http://2.bp.blogspot.com/-ZT-jvYD1ERo/UwEv8FpO8PI/AAAAAAAAA-I/6RHCrrI5ivE/s1600/flyrant.jpg

dont have any bits for them, but did a search for the arms your looking for and saw this conversion that might help you:

http://www.belloflostsouls.net/2014/06/hobby-brainleech-devourers-on-a-budget.html


scroll down the the 8th photo and watch what he does.  i'd modify it slightly and maybe cut the barrel of the venom cannon they use closer to the end and put the pair of devourer barrels from the gaunt arms on so you have a longer barrel to make it appear "cannon-like"