this post was submitted on 26 Oct 2025
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Post here if you have general questions concerning GunCAD, printing, or otherwise fabricating DIY firearms. Newbies are welcome, but users are encouraged to read Ctrl+PEW's Getting Started Guide if they haven't already.
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I had this same issue and haven’t figured it out. I’m thinking of maybe modifying the tab to have the mags sit a hair deeper into the lower. What upper are you using? I’m using the left side charging Masterpiece arms upper.