FARC using .50 Cal AR-15 rifles ?!?!?

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This rifle was among weapons seized by Columbian Military Police from FARC guerrillas. A .50 cal upper sitting on an AR-15 lower was just about the last gun I would have expected to find in service with South American guerrillas. The single shot “shell holder” design would be slow to reload – not a good design for military engagements.