Atlas Bipods 4in Flush Cup 1913 Rail Flat Back hole patterns Black 2.2-3.5in. These Atlas Bipods Gun Accessories feature a flush cup which benefits the sling swivel model. With a mil-spec type III class 2 finish the Atlas Bipods 4in Flush Cup 1913 Rail looks sleek and smart on and off the shooting range. If you're looking for a trusted and true product look no further than the Atlas Bipods 4in Flush Cup Flat Back 1913 Rail which can be used with your own hardware. Specifications for Atlas Bipods 4in Flush Cup 1913 Rail Flat Back hole patterns: Manufacturer: Atlas Bipods Color: Black Fabric/Material: 6061-T6 Aluminum Country of Origin: USA Features of Atlas Bipods 4in Flush Cup: ?an also be attached to a horizontal surface; Package Contents: Atlas Bipods 4in Flush Cup 1913 Rail Flat Back hole patterns ABI-SHW-4FC1RFBHP Additional contents Additional contents Atlas Bipods BT17 4in Flush Cup 1913 Rail Flat Back hole patterns Black 2.2-3.5in