Surefire’s nifty Rapid Transition Sight are canted at 45 degrees to allow them to be used alongside scopes on 3-gun competition rifles. I have seen, and blogged about, canted picatinny rails for red dot sights but this is the first canted iron sight that I have seen with a built in rail attachment.
Surefire has them listed on their website for $238.
[ Many thanks to Heath for emailing me the info. ]