Thanks for your thoughts on the matter. I'm not planning on a KB, just looking for maximum durability.
I'm thinking about the Oly offer to replace transferable M16 receivers. This is where the durability issue comes up. Buying a new receiver when this one wears out isn't an option. I'd like my grandkids to be able to shoot the gun years from now. This adds a new spin to the question concerning long term wear.
Having spent time in the Corps I'm pretty familiar with M16 use (abuse?). Back then though, my armorer would give me a new gun if I found a way to break anything. That's not an option with a pricey transferable.
The Ti lower might not be absolutely needed, but is it better or worse (durability, functionality, geometry) than standard aluminum?
Thanks for your time,
Matt