The SIG MPX-SD is integrally suppressed with new SIG SAUER silencer technology designed specifically for the SIG MPX-SD. A compact variant, the SIG MPX-K, is available with a 4.5” barrel.

Weight is a feathery 4.5 lbs., unloaded. A SIG Sauer ROMEO 4 red dot was mounted onto the MPX Copperhead. A quick-detach SIG Juliet 4 magnifier was also utilized for longer range targets.