Putting an FRT in a .308 Sig Spear! And the MPX, Rattler & Virtus! All of them!
This guide details the installation of Frankenstein Armory trip bars, enabling Forced Reset Triggers (FRTs) on Sig Sauer MCX and MPX platforms. It covers identifying the correct trip bar variant ('Lite' or 'Heavy') for specific models and calibers, emphasizing the need for careful installation and a thorough function check to ensure safe and correct operation. The process requires adherence to safety protocols and potentially specialized tools.







