The MCX-REGULATOR brings all the features of Sig Sauer's legendary MCX series in a ranch rifle platform ideal for varmint hunting or defense against wild predators. The MCX-R features the classic two-piece receiver design with a proprietary ranch rifle style lower receiver that is compatible with all MCX upper receivers. The lower receiver is also compatible with many aftermarket 500/590 stocks and ships with a Magpul SGA 500/590 stock, allowing for full customization for any situation. Additional features include fully ambidextrous controls and a two-stage match trigger along with Sig Sauer's new Gen II NiR Cerakote finish and receiver-integrated ARCA Rail.

This model is chambered in 5.56x45mm NATO and features a Coyote Brown Cerakote finish. One 10-round magazine is included along with a pre-installed Romeo2 red dot.