Accuracy Solutions BipodeXt Picatinny Rail M-LOK Kit Black MLOK-13S REV. Accuracy Solutions makes these rails from 6061 T6 Aluminum. They are coated to the U.S. MIL-A-8625 Type III Class 2 Anodize specification. These rails are U.S. MIL-STD-1913 compliant and attach to M-LOK STD (ASME Y14.5 DIMENSIONING.AND.TOLERANCING.2009) guards and accessories. Each rail ships with two (2) each M-LOK screws and nuts and a 1/8in hex Allen wrench. Specifications for Accuracy Solutions BipodeXt Picatinny Rail M-LOK Kit: Manufacturer: Accuracy Solutions Color: Black Finish: MIL-A-8625 type III class 2 anodizing Fabric/Material: 6061-T6 Aluminum Gun Rail: Picatinny Length: 5.5 in Weight: 1.75 oz Features of Accuracy Solutions Picatinny Rail 13 Slot M-LOK Description Picatinny Rail 13 Slot M-LOK General Specifications Material: 6061 T6 Aluminum Dimensions: OAL 5.515in Color: Flat Black Coating: U.S. MIL-A-8625 Type III Class 2 Anodize Attachment: M-LOK (ASME Y14.5 DIMENSIONING.AND.TOLERANCING.2009) Rail: U.S. MIL-STD-1913 Hardware: 2 M-LOK nuts and bolts Weight: 1.75 oz Package Contents: Accuracy Solutions BipodeXt Picatinny Rail M-LOK Kit Accuracy Solutions MLOK-13S REV C: BipodeXt Picatinny Rail M-LOK Kit Black