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The More You Know: MPI Testing

One criteria for choosing a quality Bolt Carrier Group (BCG), barrel or other ferrous metal firearm part is the passing of a Magetic Particle Inspection test. Commonly known as MPI, the process is non-destructive, meaning that the test itself does not have any detrimental effects on the part in question, so it can be applied […] Read More … The post The More You Know: MPI Testing appeared first on The Firearm Blog.
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