The main reason I bought my mp5k is that it's a reverse stretch. I can take the collapsable stock off my k gun and use it on my full size . Same stock type. I just enjoy the full size stock more. With a suppressor the collapsable stock actually balances more as the back piece is heavier . The full size stock is all plastic and hollow.See I like your full size one, but want the collapsing stock like on your K model. Only thing I'm wondering is what that set up and a suppressor would it not balance right with the wire collapser stock?