hi i am trying to decide on which p60 drop-in for my surefire 6p i want to buy. ive seen many different drop-ins from dealextreme, malkoff, lumensfactory, dereelight, solarforce, and the list goes on. but what i want to know (beside from the malkoff) which drop-ins have the highest quality and fitting (minimal gap) in a surefire 6p.

ive checked on other postings but i cant seem to find one that answers my question, if you know a posting that answers my question please direct me to it.