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ar-556 mpr bolt
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  1. Ruger Semi-Auto
    I just picked up my AR-556 MPR in 450 Bushmaster from my FFL yesterday. I took it apart to clean and lube it today. I got to removing the bolt carrier group and the firing pin retaining pin, no problems. I pushed in the bolt so that I could rotate and remove the cam pin, but the bolt felt...
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