Daniel Defense Brown Mil Spec Picatinny Vertical Foregrip - The Daniel Defense Vertical Grip includes soft touch rubber over-molding for enhanced grip, wet or dry. Inside the grip is a Dual O-Ring, water-tight storage compartment capable of storing small parts. This vert 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. 4.5 -Inches Tall 2 -Inches Wide 1.38 -Inches Thick Weight: 0.15 lb