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looking at robertos foros , i then recall how different rifle size stocks for different size people .
i think it possible or pheasable ,it could be a butt extension. for taller guys.also teh fitting onto a standard size rifle could be used as a shanking tool in close quarter battle.Pretty crude but effective.
not all teh diagrams show teh rifle with this fitting etc..maybe its to help the soldier fire the weapon in teh shoulder , simply. Just as liek some soldiers mounted their own bipods on rifles in crude form.Soldiers have much time to develop a system that works for them in comfort and professionalism.bersaglieri were famed marksmen so i guess this is related pheasability.i am no expert but is just nice to discuss teh different oprtions from a factory produced model standard model. i think you find that these possibilities there is one probability is correct.