I've been following your build for the last week or so, amazing work. Your videos are really informative and entertaining. I've been planning to make a metal Rey gun myself, but I've only got a manual mill and lathe to work with and I'm not much good at 3d modeling. For the grips, I was planning to modify, mold, and cast the grips from an airsoft gun, but they just arrived and seem very small in comparison to the ones on my Denix Mauser. Any chance you could share the sizing of your grips somehow? I came up with the same barrel diameter you did, and I'm worried these grips I got will be disproportionate.