Brian is right about tumbling with stainless steel pins. A few months ago I picked up some 40S&W brass left by a guy running a H&K full auto model something not available to the general public. Asked him about the lines - fluted chamber.
After tumbling with pins, I couldn't tell which pieces of brass were from the H&K.
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A lack of planning on your part does not necessarily constitute an emergency on my part.
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