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https://ghostopstact.com/geissele-super-dynamic-combat-sd-c-trigger/

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The Geissele SD-C Trigger (Super Dynamic-Combat) featuring an exclusive flat trigger bow, is a rugged, non-adjustable combat trigger with a sear design that provides a wide margin of safety against unintentional discharges yet still gives the operator a sharp, repeatable trigger release.
The SD-C Geissele Trigger is a flat bow variant of the Super Semi-Automatic (SSA®) trigger