Geissele Maritime Bolt Catch Black GEI. The increased surface area promotes ease of function when locking back the bolt or releasing the bolt after a magazine change. In addition the extended controls add an increased functionality for left handed shooters who no longer have to break their grip to manipulate the bolt catch. Left handed shooters can easily reach the controls using the index finger of their left hand making magazine changes and locking the bolt back much more fast and efficient. Aggressive checkering covers the surface of the levers giving the Geissele Maritime Bolt Catch a textured surface that enables positive feedback to the shooters hand when being used with gloves or at night. Specifications for Geissele Maritime Bolt Catch: Manufacturer: Geissele Color: Black Condition: New Country of Origin: USA Package Contents: Geissele Maritime Bolt Catch Geissele GEI08-153: Maritime Bolt Catch Black