Quick view Sig Sauer Sig Sauer M18x, Sig M18x-9-rx M18 X Rx 9m 3.9 Or 21r Coy $1,552.60 $1,429.99 The m18 the choice of the u.S.Military, now outfitted with the most advanced xseries features.The m18x includes a factory mounted romeo-m17 red dot optic featuring a ruggedized aluminum housing, aspheric glass lens for zero distortion and is fully... Compare Add to Cart