The SU-76 is a good little asset to have in your back pocket, a mobile howitzer and packs quite a punch for it's size (the classic 76mm soviet Zis gun) and is handily mobile (see below):
The UM Model kit is finely modeled but has lots of parts (too many methinks for a quick build) so some degree of patience is required in its construction (Hint: Don't try and rush it like all UM kits).
No crew which is a little disappointing (as they are needed IMHO), but there are plenty of candidates in the spares box. Another Soviet "Chain of Command" asset to hand!