MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

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When the slide is closed and you insert a new mag, you just cycle the charging handle. When the slide is open and you insert a new mag, drop the slide with the slide catch. Slide catch and the safety are still accessible with this kit.

And this won't fit a 6.1 hicapa. It's meant to fit a 5.1. 6.1 will be too long.