I was hoping there would be someone else jump in first, but here is my .02 on this. When I study the NRA sporter and compare it to the other examples, I come to the conclusion that the same person did the checkering. In my opinion, I believe it is a case of "S man" taking in a job that he could turn around quickly. Maybe it was all the customer could afford at the time. He used a pattern that he was familiar with and could probably cut quickly; adapting it to the oversized, in comparison to his own, NRA stock. Bills still had to be paid during that era and it was probably an easy job that satisfied the customer and produced some income. That's my 2 cents worth that is probably only worth .01

It ain't ignorance that does the most damage, it's knowing so derned much that ain't so! J. Billings