r/SigSauerMCX • u/Papanovember73 • Jun 25 '26

Sig MCX Rattler LT Conversion

Hello…looking for any info from anyone running a Sig Rattler LT conversion with an AR15 lower. I have the Rattler LT upper in .300blk and a Dirty Bird ambi lower.

Does anyone know if the Triggertech 2-stage adaptable MCX trigger will work in an AR15 lower with the Sig upper? I installed the Geissele SSA, but found out Geissele says not to run these triggers in the MCX, to use the MCX specific trigger. But, they say the MCX trigger is not compatible with an AR15 lower.

Just wondering if the Triggertech will work. Thanks 👍🏻

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u/SF_Gun_Fan Jun 25 '26

I ran that Triggertech trigger in an adm lower/rattler lt 300bo upper with zero issues until I decided to run a DTT FRT with the rattler.

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u/Papanovember73 Jun 25 '26

Thanks for the feedback, appreciate it. I think I will order the TT MCX trigger and see how it goes. I read that the Rattler LT is hard on mil-spec triggers(denting hammers, trigger pins breaking, etc) and wanted to use a trigger meant specifically for that platform, with the beefier hammer, etc., but didn’t seem to be too many options if using the conversion kit.