Daniel Defense's Vertical Foregrip (Picatinny)"" updated in 2014"" now includes soft touch rubber overmolding for enhanced grip"" wet or dry. Inside the grip is a Dual O-Ring"" water tight storage compartment capable of storing small parts. This vertical grip is extremely lightweight and utilizes a simple yet durable mounting method for 1913 picatinny rail systems. Not Compatible with KeyMod or M-Lok rail systems.