1913 Picatinny Rail CAD Templates by FFFTech/FFFTechnology
STL and STEP files of dimensionally accurate 1913 Picatinny rails. I use these models myself for developing accessories for modern carbines and the like.
These files are intended to aid in firearm accessory design. Whilst they can be 3D printed, they're meant to be used in CAD software such as Fusion 360.