The magazine is for the bolt actions, the 1922 & 23A Sporters and the early 1919 NRA's. The top of the notch is in the same possition so it will work as long as you insert it with the bolt closed or pull it down to to make sure it's at the lowest possition. When in use it should stay down because of the cartridges pushing on the bottom of the bolt. It's a Triple-K after market and I have found these often have issues feeding. Original magazines for the 1912's show up from time to time and the prices seem to be dropping so you might be able to get a factory magazine reasonable (more than the Triple-K though). I'd sent it back if they accept returns.
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