Sig MCX 5.56 to 300 BLK Conversion
This video details the process of converting a Sig MCX from 5.56mm to .300 Blackout. It covers the necessary steps for swapping barrels, including handguard removal, loosening specific screws, and adjusting the bolt carrier group's piston arm. The importance of proper reassembly and torque specifications is also emphasized for safe and accurate operation.









