Windham Weaponry RMCS-4 Multi-Caliber Rifle Kit
This rifle's interchangeable barrels, bolt carrier groups and magazine wells takes AR-15 modularity to the next level with everything needed to shoot four different cartridges tucked neatly into a single case.
Tested: Windham Weaponry RMCS-4 Multi-Caliber Rifle Kit
Windham Weaponry recently decided to take AR-15 modularity to the next level and to reduce the cost of converting a rifle to fire another cartridge with its Multi-Caliber System (MCS).
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