PC--Max Dmg MAGMAS ARM?

Hello:

I got this hammer drop on the Hell's Precipice Mission:

A Purple Max Damage Magma Arm, and did not identify it yet.
I haven't seen or heard of one of these yet. Should ID it or leave it unidentified?
Thank your for your time.

The Magma Arms look exactly like the regular pvp hammer. Unidentified and identified between 1-5k max.