LMT’s 12" Piston Barrel vs. Reality - How Well Can an SBR Group?
This video provides an in-depth review and performance test of the LMT 12" 5.56 piston barrel, designed for the LMT MRP platform. The analysis includes a detailed barrel inspection, gauging, headspace checks, and borescope footage. The core of the video features three 30-round group tests at 100 yards using Winchester M193, AAC 77gr OTM, and IMI Razor Core 77gr ammunition. The shooting setup is fully detailed, utilizing a Vortex scope, Geissele SD-3G trigger, A5 buffer system, and measured with Mantis X10 and Garmin C1 Pro. The results highlight varying performance, with M193 showing horizontal stringing and IMI Razor Core achieving the best A-ZED score. The video discusses gas feel, ejection patterns, and velocity comparisons to assess the viability of a 12" piston AR barrel for precision builds.










