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The LANTAC E-CT1 Single Stage 3.5lb Trigger is not compatible with the Sig MCX. The MCX uses a proprietary trigger and will not be compatible with AR15 pattern triggers. I would recommend the Geissele Super MCX SSA Trigger or the Triggertech SIG Sauer Adaptable Trigger. Both options can be found linked below:
https://www.opticsplanet.com/geissele-05658-super-mcx-ssa-m4-curved-bow-ar-style-steel-05-658.html
https://www.opticsplanet.com/triggertech-sig-sauer-mcx-adaptable-trigger.html
The LANTAC E-CT1 Single Stage 3.5lb Curved Trigger is a drop in trigger kit. It includes the hammer and all necessary components to drop in and go. It also comes with a pin set included with the trigger assembly.
mine did. but mine is made by timney not rise armament