Extar EP9 Mil-Spec Buffer Tube Adapter

thingiverse

This is an update to the original design found here: https://www.thingiverse.com/thing:4088946 While the original design is great, I found (and other users) that some of the measurements are off. This allows for a lot of play when a mil-spec buffer tube is installed. This is a safety concern for me. Also, the top left and right covers are off resulting in an improper fit against the top rail. Not only does this look weird, but it also makes it difficult to teardown the EP9. The changes here aim to correct the aforementioned issues. First off, the main adapter threads were corrected to properly accept a mil-spec buffer tube. The top left and right covers were adjusted to be taller and the overall length shortened to sit nicely against the top rail. Further work may need to be done to ensure a proper fit. I also worked on a castle nut, which is not included here, to better secure the tube and finish off the look, but I'm still working on it. You'll find that when you import the STL files into your slicer (I used Cura), you'll need to scale the main adapter size by 254% and the top covers to 2540% to be the correct size. You'll need supports to print the overhangs. I recommend a fine resolution with cubic infill at 100%. I printed these parts in PLA using my personal printer for testing, but recommend using nylon or carbon fiber. The same installation instructions apply from the original design. You can find the instructions with pictures from the link provided above. Disclaimer: As per the original, use this adapter at your own risk. I am not responsible for any damage or injury caused by using this adapter.