M-LOK Handguard As compared with a traditional AR-15 platform where you’ve received a barrel nut holding your handguard set up, the MPX’s handguard can be eliminated. Just come out the entrance receiver pin. Beneath: The firing pin lock style (highlighted in yellow) around the MCX Virtus from the MCX Smaller https://sig-mpx-k86306.tribunablog.com/5-easy-facts-about-sig-sauer-firearms-for-sale-described-35972815