.223 Rem | 5.56 NATO

Sig Sauer

Sig Sauer RMCX556N16BLTB MCX 5.56 NATO 16-Inch Barrel Rifle with Black Finish

Sig Sauer

Sig Sauer MCX Spear LT 5.56 NATO Rifle with Folding Brace and 11.5-inch Barrel - Part Number PMCX556N11BIR10

Sig Sauer

Sig Sauer RMCX556N16BIR MCX Spear LT 5.56 NATO Rifle with 16-Inch Barrel and Folding Stock

Sig Sauer

Sig Sauer MCX Spear LT 5.56 NATO Rifle with Folding Brace and 30-Round Capacity - Model PMCX556N11BIR