OPEN-SOURCE, I have both .step and .stl files available aswell as my .f3d file

Nerf rifling with options for 15, 12, 10, 8, 6 or 4 degrees of angle. Has ~12.55mm of crush

Most options use 4 rows of 3

Options marked as compact use 2 rows, 3 row has 3 rows

I may be adding extended 6, 8 or 10 row versions for the lower angled variants

HARDWARE

2x M3x4 bolt

2x M3 nut

12x M3x10 bolt

12x F683ZZ (3x7x3 flanged) bearing

open bcar

Accuracy results

I achieved a best result of 14cm @ 30m using 1.3g tdarts hitting 190fps with 12 degree variant, I havent tested other angles or at different velocities yet

please post your results in the comments