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The type 27 is one of the largest of the FW3 designs. It is octagonal in plan with walls between 9 ft 9 in and 11 ft 6 in (3.0–3.5 m). The outer walls are 36 inches (91 cm) thick and have embrasures suitable for rifles or light machine guns on each facet. It has a central well open to the sky that could be used as a light anti-aircraft position.
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