HG #018 Impulse Gundam Lancier 1/44 scale model kit. 
From the Gundam Build Divers series.
 
The Impulse Gundam Lancier from "Gundam Build Divers" is Supremely posable for maximum action after assembly. It's armed with its distinctive lance and shield and comes with a booster for underwater navigation, which can be mounted on its back.

Assemble required. • No glue required for assembly; hobby nippers are required (Sold separately) to remove parts from runners.