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Detail of barrel from the prototype with the grip missing. Step mics at .4757 inches. Barrel mics at .4721 inches. |
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Barrel detail from the prototype with the brown grips. The step extends .27 inches. The rings extend .35 inches. |
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Barrel detail from S/N 23 production prototype. The step extends .44 inches. The rings extend .28 inches. |
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Barrel detail from a production gun S/N 36137. The step extends .23 inches. The rings extend .35 inches. |
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From the few examples I have measured I believe the exact location of the barrel rings was left up to individual machinists, but is generally about a quarter-inch from the end. According to Dan Simmons there is also a step at the breech end of the barrel in front of the chamber boss. “The function of these surfaces is to give a very close fit with the barrel bushing of the slide and recoil spring-bushing when the slide is in the forward or firing position.” |
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