This is a genuine AAM rear axle shaft for the 11.5 rear axle found in some 2019+ Dodge Ram 3500 trucks. Here are some specifications from the AAM website:
40192275 | RAM | RAM 3500 (D2) | 2019+ | 11.5″ 14 Bolt – Rear Axle | L/R | 30 | 1014.8 | RAM 11.5″ REAR DW AXLE SHAFT 1014.8 mm / 30 teeth |