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If I press on the mystery part, it compresses the spring, but I can't find that this actually does anything. Furthermore, in my limited experience, no other extension I've ever seen has this as a separate part. Like I said, I don't really get why it is.
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I don't know because I have never seen it but maybe it's for cushioning the forward force of the weight of the shells. Nordic did have a problem with their tube extensions breaking and separating from the base when they first came out.
GC