Airsoft Fire Selector Shim HK416/M4/M16
thingiverse
On a Dboys H&K 416 I serviced, the fire selector wasn't parallel with the body of the lower but sitting at an angle, making it feel awkward when manipulating it. This shim sits between the fire selector and the body on the outside, making it parallel to the body. I'm assuming it will work on M4 and M16 rifles as well, but I don't know. Leave a comment if it works. It will add a bit of friction to the manipulation, but it significantly improves the feel IMO. Source files for FreeCAD added for easier remixing.
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