MIL-STD-1913 Picatinny rail. 8 & 12 inch long

Picatinny Rail using mil-std-1913 engineering drawing. designed to mil std, not nato. if any design changes or adaptations desired, let me know and I'll see what I can do. As a side note, this part was modeled in inches not metric. So when modeling let your slicer know the correct units.