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. In 1925 Colt began hardening the front 1/3 of the slide by heating them up then quenching them in oil. 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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