Hi and thank you for this awesome detailed post. I have one question. In reference to the directions
" I then cut a piece of 22mm diameter 3mm walled clear acrylic tube to length and slid it into the receiver until it sat where the barrel would normally be. The 3D printed LED end cap was assembled and the unit was then placed through the hole at the mag well, and placed over the end of the acrylic tube. The wires for the LED were once again cut to allow them to be routed back to the counter box. "
The parts list for barrel LED mount from Lee McCormack - Shadow Defense Systems on Shapeways. Which I confirmed from Shadow Defense is the LED and Acrylic Tube Support that they're selling, description shows "Designed for use with a (20mm OD, 18mmID Bore) Clear Acrylic tube." I'm just trying to clarify, Instead of 22mm clear acrylic tube should I instead get the 20mm? Or is there something I'm missing. I'm very new at this type of hobby. Thanks for patience.
Shadow Defense link below for the LED and Acrylic Tube Support
https://www.shapeways.com/product/MEX83SXWX/blastfx-e11-led-and-acrylic-tube-supports?optionId=64236933&li=marketplace