I am about to order a Kydex Sheath for my Cris Reeves Mountaineer II.I am going to have it to also house a DMT flat sharpener on the back.I would like to add a Fire Steel to one side but do not know alot about the different types.I would like one 4" long or so.No plastic hande to add bulk.I have seen some that have a block of magnesium for tinder.Is this necassary?Do any of you know if the coating on the Chris Reeves knife will affect the striking ability of the Fire Steel?I plan on using these together.What would be my best choice?Where to purshase it?What is the best tender to use along with this type of ignition system?Any other ideas you might add for the ultimate sheath system?