User blog comment:Tommygun9504/Weapon Review: R870 MCS MOD/@comment-1456811-20120227143908/@comment-4713738-20120227185638

It's an NX Rare, so maybe some Case Spam is in order.

I know you can score one from MYST-Delta (obsolete) and MYST-Infinity (also obsolete) but you might have luck with a HiSec case, maybe a MYST-G.