All of my working guns have at least one twin, sometimes three or four.
I break-in and function fire ~500 rounds with the carry load and magazines. It gets cleaned, logged, and put into carry rotation. The twin then becomes the practice primary and ultimately beat to hell, often I will run until malfunction & failures that way Ive got an idea of longevity. Its also great because I don't have to fart around with cleaning after each session, take my primary out of rotation, or impart wear & tear on it (yes repeated disassembly causes wear and opens door to reassembly error).
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