My first 1911 had a trigger pull that felt like dragging a knife blade over rough concrete. The 1911 sear is case hardened maybe 1/1000 inch thick is hard. But examination under magnification showed manufacturing burrs, removing them (fine Arkansas stone) made a nice trigger.
I would limit any trigger work to similar smoothing. Changing angles is extremely risky, and best done with easily replaceable parts (Oops, start again), not Luger fitted and numbered parts.
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