Blank Firing Attachment

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BFA - Blank Firing Attachment. Big yellow metal blob attached to the end of your weapon to enable it to use blank ammunition. I think it has something to do with stopping some of the gas escaping from the muzzle in order to re-cock the rifle via the gas mechanism as there is obviously no round fired to cause this as with live rounds. Please correct if wrong!

IMPORTANT NOTE: Should be removed if switching to live rounds otherwise something unpleasant will happen.