This is a skin for the Semi-Automatic Pistol item. You will be able to apply this skin when you craft the item in game.
The semi-automatic pistol (commonly referred to as the 'P250' or 'P2') is a fast firing, medium damage weapon that has a moderate bullet velocity and steep damage drop-off.
It is an extremely popular weapon due to it's effectiveness at short-medium distances and it's low cost. It can be easily used as a primary weapon or as a compliment to pretty much any other gun.