DX has a new 52mm drop-in for TR-1200 type bodies and probably for Maglite's with some minor modifications. The specs don't tell much but 6xR5 may be even better than a 3xT6, because of the enhanced throw of smaller emitters. I still love my 5xR2 setup as it is as throwy as a big head single XM-L but looks twice as bright as one.
Hmm, nice find. I was already in need of another TR1200 body and if I get this I may take these both for even lower.
What does XP-G and XP-E change in R5 bin BTW? I guess XP-E R5 doesn't give a throw like an XP-E R2 but maybe has a lower max current rating. XP_G is rated up to 1.5 A while XP-E is usually 1A max.