FIELD: armored structures.
SUBSTANCE: invention relates to armored mobile or stationary means, for example, armored vehicles, in particular, to loopholes for small arms. Collar of armored facility with protected volume, limited by protective wall, has through hole for firing, made in protective wall and closed by movable gate valve. Gate valve is made in the form of two parts moving in concert in opposite directions. At the same time part of gate valve is connected with control mechanism with possibility of opening hole for firing by forced movement of gate valve.
EFFECT: higher reliability of protecting an armored vehicle by increasing the speed of controlling the cross-section of the opening for firing.
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