mp5 retractable stock upgrade

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Added a retractable stock for the mp5.

You need to put "CR lock stock" in "CR cylinder lock stock" and glue “CR cylinder lock stock” in “CR main body 1”.

Glue the two “CR slide” in “CR stock”.

Assemble “CR main body 1” and “CR main body 2” with the "connector".

And then slide the stock in the body.