I have the Bugout 535-2204 Anniversary Edition with anodized titanium handles.
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I don't think the word "robust" would accurately describe any Bugout. Though I will say that the titanium scales do make it much more solid than Grivory or CF Elite.
I have not made any modifications to it other than some slight pivot adjustments. Like with most of my Benchmades, there is some slight horizontal (but no vertical) blade play when I've adjusted it to be drop shut.
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