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There is a guage you need for the locking shoulder, it is a stepped rod that inserts in the hole to get the measurement and be able to order the proper locking shoulder. My FAL barrel had flats on the chamber area so a large tight fitting wrench was all I used with the receiver clamped in a fixture in a vise.
Rich
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You know you might be facing your doom,when all you get is a click when you're expecting a BOOM!
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