I bought a XDs9 and in the case there were two mags one 7 and one 8 round. Two back straps and a extra base plate for mag. Wondering if the extra base is for the 7 round mag or just extra for the 8 round. It would be great if both were the same length. I was surprised at the felt recoil of the XD against my Ruger LC9s. The Ruger seems to have less recoil.