Young Liebig has a prototype chain guide built by a family friend that produces some pretty extreme bits for some pretty extreme people. I'm hesitant to say too much because I think you should give this guy a follow and see\ask for yourself (maybe start selling them.wink.). Basically it's a super strong polymer that needs to hold up to the strength of demands of defense needs where breaking could mean life and death. Liebig senior raved about it's durability and function. Instagram: @brutalengineering
Credit
Jack Rice