New in box Sig Sauer MCX Rattler chambered in 5.56 
5.5" barrel
1-30 round magazine
The Sig MCX Rattler in 5.56 was designed to be as discreet as possible while retaining all the robust capabilities of the MCX. Sporting a 5.5" barrel, folding pistol brace & MLOK rail the MCX Rattler is the ideal choice for fast moving operators