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The Blank firing attachments usually screwed onto the muzzle (as in the Swedish Mausers) or clamped on TIGHTLY to the barrel (FN, M-14) etc. In many cases, they were painted to denote that they were attached. The Swedish BFA has a splitter inside it to shred the wooden bullet, and the shredded pieces of the bullet exit through the holes in the sides. In the case of BFAs for the FN and M-14, there is usually a pin or rod that fits inside the barrel, so that there is enough pressure from the crimped blank to operate the action. BFAs are usually a lot larger than the object in the picture.
I have an exact copy of the one the OP has posted a picture of in front of me right now. It does not give a sufficient attachment to secure it tightly on a rifle, and would probably be lost within the first five rounds fired if wooden bullets were used.
The Germans in WWII did use wooden bullets, and also the Swedes. The Swedish Manual states that they are not to be fired at a person at a range of less than 100 meters. With a bolt action rifle, a BFA is not really required as wooden bullets lose velocity and accuracy quickly. However, the Swedes did develop a BFA that threaded onto their training rifles, after 1955, because of the possibility of an accident.
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The Blank firing attachments usually screwed onto the muzzle (as in the Swedish Mausers) or clamped on TIGHTLY to the barrel (FN, M-14) etc. In many cases, they were painted to denote that they were attached. The Swedish BFA has a splitter inside it to shred the wooden bullet, and the shredded pieces of the bullet exit through the holes in the sides. In the case of BFAs for the FN and M-14, there is usually a pin or rod that fits inside the barrel, so that there is enough pressure from the crimped blank to operate the action. BFAs are usually a lot larger than the object in the picture.
I have an exact copy of the one the OP has posted a picture of in front of me right now. It does not give a sufficient attachment to secure it tightly on a rifle, and would probably be lost within the first five rounds fired if wooden bullets were used.
The Germans in WWII did use wooden bullets, and also the Swedes. The Swedish Manual states that they are not to be fired at a person at a range of less than 100 meters. With a bolt action rifle, a BFA is not really required as wooden bullets lose velocity and accuracy quickly. However, the Swedes did develop a BFA that threaded onto their training rifles, after 1955, because of the possibility of an accident.
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