Roger that on the service slide use. However, these slides were obtained by the Army from Colt in the 1950's and used as rebuild slides during the rush for parts at the start of the Korean War. So.... I assume these commercial marked slides would then qualify as a service slide as well. Granted I'm no expert on these.... just curious. The commercial slide on this NM is also "P" proofed on top near the rear sight notch. Pretty interesting...
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"Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote!" - Benjamin Franklin