The Ruger 10/22 takedown comes with its own carrying case. The case is designed for the gun to be broken apart into three distinct parts, the stock, barrel and the optics. I'm curious for those of you that have the 10/22 what you're using for optics and what you are using for the base. How do you ensure it returns zero when you put the optic back on the assembled weapon. I appreciate any input y'all have.