The Brownells BRN-180 project successfully modernizes the AR-180's piston operating system for compatibility with ubiquitous AR-15 lowers. This involves significant engineering to integrate modern features like M-LOK handguards and side-charging handles, while also adapting the system for calibers like .300 Blackout by adjusting gas system length and piston size. The process highlights technical hurdles such as carrier shortening and material treatments for enhanced reliability.
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