Thread:ZeroExalted/@comment-5093628-20140729004136/@comment-5093628-20140729044203

From what I can tell, ACE variants are your original NX Standards before the Reboot patch. Nexon made another copy of the same NX standards without the ACE tag (slightly nerfed version of original) available in the Rental Shop for GP.

So for example: there is a G36E Valkyrie and an (ACE) G36E Valkyrie where the latter is slightly better in terms of stats.