This was a concept posted on Nerf Modders Welcome. Using files from Thigiverse, this has been re-mixed into the Reaper Kit. I did all my prints at 30% infill using a Creality CR-10 Mini. Please respect this open source and creative licensing, as it is not for retail sale, but for the modding community at large, enjoy!!!! The rails are not published as they are designed and sold by Blasterforge Phil. Please look him up on Facebook, his prices are very fair and he does an amazing job with outstanding fit and finish. https://www.facebook.com/patis.package