The FN P90 was designed to be used in conjunction with heavy body armor, which is why most shooters find the stock length to be too short.
Laws in some states have recently required extending your PS90 stock - we make it simple

The Damage Industries P90 Stock Extension addresses this dilemma, providing a user-adjustable solution that is durable and effective. 
Features durable Delron extensions and pad - Aluminum Plate

The Butt Plate & Pad Assembly measures 1" in width.
This kit gives you everything you need to extend your stock

Includes:
1 x Buttpad
1 x Assembly plate
2 x 2" extension
2 x  Button/Socket head Hex Bolts
(choose)