First, I would consider adding some pillars and bedding the Duramax stock to get the action firmly fitted in the stock. The magazine well is likely going to be oversized in the Duramax. So what I did was put a thin spacer (business card thick) between the bottom of the bolt and magazine lips and taped the magazine in place on the action. Next I put 4 small balls of epoxy putty in the corners of the stock magazine well. Put some release agent on the bottom of the magazine and bolt the action back into the stock pushing the bottom of the magazine into the epoxy putty. Once the putty hardens, you have the base for your magazine setting at the right height for proper feeding, and the magazine lips do not come into contact with the bolt causing a stress point. Putting some Velcro strips in the magazine keeps the magazine box firmly in place, but still allows for removal. I did away with the L-clip, since it does not work in the oversized stock well on the Duramax. LOL.
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