Troy Modular Combat Grip Aluminum - Black A0BT-00. These Long Gun Grips by Troy Industries feature a three-part modular design with a waterproof high capacity storage compartment that fits easily on all Picatinny rail systems. When you need versatility and durability in an ergonomic grip the Troy Waterproof Combat Grip is the right choice Specifications for Troy Modular Combat Grip: Manufacturer: Troy Fabric/Material: Aluminum Condition: New Country of Origin: USA Features of Troy Picatinny Combat Grip OY-VG-MODCOMGRIP: Three part modular design. Waterproof high capacity storage compartment. Thumb screw sold separately. Grip converts easily into two sizes: 4 5/8" when completely assembled and 3 1/4" when in short mode. Package Contents: Troy Modular Combat Grip OY-VG-MODCOMGRIP Troy Modular Combat Grip Aluminum - Black A0BT-00