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Built by upgrading a Tier 1 bunker into a rifle garrison.
Built either by upgrading a Tier 2 bunker into a rifle garrison, or by upgrading a tier 1 rifle garrison. The cost is the same.
Built either by upgrading a Tier 3 bunker into a rifle garrison, or by upgrading a tier 2 rifle garrison. Note that the total cost is cheaper if you upgrade a tier 2 rifle garrison to tier 3 rather than transform a tier 3 bunker into a tier 3 rifle garrison, because you have to use concrete materials once instead of twice.