@BassCliff NJ has similar wording to that for defining and “assault weapon” but thumbhole stocks are not specifically mentioned. You never know in this state.
I am building a “steel challenge” style rifle that will utilized a thumbhole stock, which would be no problem. However, I’m also using a...
.308 and 7.62 out of the M1a are both fine. This article has more info than needed but in the end (the second to last paragraph) you’ll see your answer.
I’ve shot both from my M1a and haven’t blown up yet. 🤞🏻
https://www.thearmorylife.com/7-62-nato-vs-308-is-there-a-difference/