This is Reinforce Zwei (リインフォースII) from Mahou Shoujo Lyrical Nanoha StrikerS (魔法少女リリカルなのはStrikerS) series.
Mahou Shoujo Lyrical Nanoha StrikerS Reinforce Zwei PVC by Alter (アルター 魔法少女リリカルなのはStrikerS シグナム). Original sculptor 爪塚 ヒロユキ. Released on May 2008 with an MSRP of ¥6,090. This is the re-issued version which was released on March 2009.
A little close up.
From the other side.
Here’s a 2D illustration of Reinforce Zwei.
Reinforce is really sweet ! Alter made a beautiful figure ^^