UrbanMech UM-R60L

Overview
The UM-R60L replaces the AC/10 from the -R60 with an AC/20, at the expense of some armor. With only seven shots worth of ammo, you'll need to make every shot count.

Strengths

 * Full 360-degree torso rotation
 * Small profile

Weaknesses

 * Designed for dense urban combat, of which there is little in MWO.
 * Very ammo dependent.
 * Slow speed and low maximum engine cap.