The Benchmade 581 Barrage Knife is a spring assisted model that combines speed and strength in one complete package. The 2011 version features an aluminum handle with a M390 super steel blade. The Benchmade 581 Barrage Knife also has a reversible pocket clip and an AXIS Assist locking mechanism. The AXIS is known as the strongest assist locking mechanism on the market and can be operated ambidextrously. $187.