I just had my receiver milled, coming from an old flat back 30-06 to 300 WM, to fit in a MDT LSS-XL chassis. In order for the magazine to fit properly, we cut the rear of the receiver back until it was flush with the fully retracted bolt. My magazine is MDT's and I believe it is the 3.715 mag length. I will be able to fit 3.600" oal 300 mag cases into it.

Here are a few pics, still waiting on my Apache barrel though.






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