Blank-firing adapter

A blank-firing adapter or blank-firing attachment (BFA), sometimes called a blank adapter or blank attachment, is a device used in conjunction with blank ammunition for safety reasons, functional reasons or a combination of them both. Blank firing adapters are required for allowing blank ammunition to cycle the bolts of most semi-automatic and automatic firearms. It can also be a safety feature designed to break up the (wooden or plastic) plugs replacing the bullet in military blanks (with the added benefit that a live round mistakenly fired will expend most of its energy upon colliding with the BFA, reducing both the range and damage inflicted) as well as divert the hot gases from a blank discharge out to the sides, reducing the risk of injury to the target of an aimed shot.

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