Geissele 3-Hole HK Accessory Picatinny Rail Black. This 1913 Picatinny spec rail section allows the attachment of various 1913 Picatinny spec rail-mounted accessories such as lights vertical grips etc. Machined from milspec-anodized aluminum. Specifications for Geissele 3-Hole HK Accessory Picatinny Rail: Manufacturer: Geissele Finish: Milspec Anodized Fabric/Material: Mil-Spec Anodized Aluminum Gun Rail: Picatinny Gun Type: Rifle Gun Make: AR Platform Gun Model: AR-15 Package Contents: Geissele 3-Hole HK Accessory Picatinny Rail Geissele 02-212HKB: 3-Hole HK Accessory Picatinny Rail Black