Windham Weaponry RMCS-4 Multi Caliber AR15 System - NRA 2016 - Gear-Report.com
Roger from Windham Weaponry shows the MCS system that allows one serialized lower to be reconfigured to fire .223 rem, .300 BLK, 9mm, or 7.62x39
Roger shows changing from .223 to 9mm in about 2 minutes.
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