![]() That's all I can tell you going off of memory, as I'm not home at the moment and can't look at my reference books. Colt adopted the new techniques after the war in their commercial production, and by the time the military started buying replacement slides they were all "hard slides" that were fully heat-treated throughout. Remington Rand and Ithaca both made slides using the new processes and were in the testing stage when the war ended. By 1944 experiments were being made with new technology that allowed the slides to be fully heat-treated throughout, to include the locking lugs and to eliminate the need for the hardened breech insert. In 1943 the slide stop notch was flame-hardened to reduce peening damage. Later they also installed a hardened insert in the breech face where the firing pin hole was to prevent deformation. If your firearm does not appear in the listing, please understand that this is not a. If multiple models appear for your serial number simply match the date with the appropriate model, as certain vintage firearms can share serial numbers between different models. In 1925 Colt began hardening the front 1/3 of the slide by heating them up then quenching them in oil. Enter the serial number, without spaces or dashes, to search the database. As a result the early slides were prone to cracking and severe wear from peening. ![]() There was no way to machine a hardened slide blank, and if one attempted to heat treat a slide after machining it would warp. When the 1911 was first introduced the technology of the time didn't enable Colt to heat treat the slides at all. ![]()
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