This is a posable action figure from the Nendoroid series.
I've said it before and I'm sure I'll say it again: there's nothing more awesome than a really serious character being made in a really cute design! More from the GoodSmile website:
An action figure ready to infiltrate any location!
From "METAL GEAR SOLID" comes a Nendoroid of the main character of the series, the infiltration specialist Solid Snake! The rough look of his character has been preserved while still giving him the cuter appearance provided by the Nendoroid design!
He is the first ever Nendoroid designed to be posed in a prone position, allowing you to display him sneaking around just like in the game! Optional parts include his handgun, an assault rifle as well as a cardboard box to keep him hidden! An optional low-polygon face part is also included, allowing fans of the original game to enjoy the classic Snake once again!