O f mossberg 22cal autoloader that loads through stock?

Answer 1

There were several Mossberg .22 rifles that load through the stock. The 51M, 151K, ect. These have a removable inner rod that is draw back through the buttplate, and cartridges are inserted into an angled hole in the side of the stock. Mossberg also made rifles that loaded from a box type magazine, and an under barrel tube magazine. There are more than 100 different Mossberg 22 rifles made.