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Mfg Item #: CALX-MCX-16B-556-TAP
CALX-MCX-16B-556-TAP, New in box Sig Cal-x 16" 5.56mm Nato barrel.
This is a brand new Sig Sauer MCX Conversion kit to convert your MCX to 5.56mm NATO with a 16" barrel. This kit will work with the new Virtus series and is also backwards compatible with the pre-Virtus models if you purchase a tapered lug bolt (not included).