Bought this new directly from AP 2 months ago, before I found that my FSQ requires a specific diagonal. Took it out only once (yesterday, in fact), to inspect and confirm that I couldn't use it.
New, the diag and adapter together cost $330. Unfortunately I made a cosmetic mark on the barrel when I slid it in (set screw wasn't out far enough), so I can't claim perfection, but of course the mirror is untouched and diag as a whole in otherwise brand-new condition.
Asking $290 including shipping within CONUS, or will consider trade for a type-6 Nagler in 9-13mm range (9mm preferred). I accept money orders/bank checks -- personal checks OK but will be held until cleared at the bank.