Quick view Sig Sauer Sig Sauer Mcx, Sig Pmcx556n7bltpcb Mcx 556 7.75 30r Blk $2,699.99 The mcx rattler lt now in a more modular, more capable package.Designed to meet the needs of special operations forces, the mcx rattler lt features fully ambidextrous controls, including an ambidextrous bolt-catch, bolt-release; adjustable gas piston for... Compare Add to Cart