If you're looking for a Plague Needle ( 5 stars) by far one of the best guns for Lord Vanaduke or maybe the BEST one!
http://wiki.spiralknights.com/Plague_Needle

The best thing you can do is buy directly from me Toxic Needle (3 stars handgun)

Pros:

-No need to spend Crs on autogun or autogun's recipe
-No need to spend Krogmo Knoins on Plague Needle's recipe
-Save those 50 Krogmo, yes .... 50 KROGMO KOINS for the next recipes
-Save some time on pvp if you dont like to spend too much time there
-Save time crafting Toxic Needle!

in case you're looking for Voltedge, im also selling Shockburst Brandish, same story as the Toxic needle, you're going tos ave plenty of krogmo koins and save time crafting it

Mail me on spiral knights , my name is : Drawster