wow that looks great, do you have a gallery I could go through?
Here's another plug. Its wide enough so the barrel bushing holds onto the rim even without notches to fit in.
The plug is an empty .45 cal casing. Real steel GI 1911's can use them as a temporary recoil plug replacement, apparently Browning designed it so the .45 casing would be a perfect fit. I love how it also functions with our 1911s, but just not as smooth.