It called the rear baffle. It serves two functions. One , its the last line of defense to keep stuff out of your snot locker in the event of a case faliure and two, in conjunction with the bolt handle provides the primary extraction. You can use it as is but you may have a heck of time extracting a fired case.
You could try http://www.sharpshootersupply.com/ for a replacement.
Bill
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