Excellent idea - Strike Industries Multi-Function End Plate / Anti-Rotation Castle Nut

Looked like a neat idea. Picked up one to try out on a build I wanted to swap a few tubes on. This was exactly what was called for. Easy to install, easy to swap tubes in and out. The little set screw was fiddly on the first installation, but has become easy to use after that. Already picked up a 2nd one and will probably pick up a few more. It doesn't get much easier than this.