As for a M1A in 30-06, I don't Assume there has been one particular manufactured just before. Even so, the M1 Garand went through some experimentation after WWII (and I believe even a little bit during the war) to incorporate a detachable mag, which was The premise in the M14. https://federal-american-eagle-3020626.p2blogs.com/19725922/helping-the-others-realize-the-advantages-of-federal-american-eagle-30-06-for-sale