Commander size slide and frame. If you need an Ambidextrious safety, then get one that is ultra low profile. Non beavertail grip saftey but a slightly extended one like what is on some Colt Commanders. Long or short trigger based on your hand size. Checkered plastic grips and checkered mainspring housing and frontstrap. Rear slide serrations only. Heine straight 8s or 3 dot in Tritium (your own preference on nightsights also apply). Fixed sights would be ideal. For the love of Pete no "tactical" rail. Beveled but not extended mag well. Id stick with Wilson or Kimber, or Colt, or Chip McC 7 round mags. Commander style hammer. I would also go with the Series 80 platform for political reasons within your duty station. Id go standard on the slide release as well. No need for a full length guide rod but if you have it, it is just as good. A light weight frame only saves 4 ounces so that is not a biggie either. No need for a lanyard loop I wouldnt think. Stainless or some ultra durable coating like melonite or duracoat.
Did I miss anything?
I would personally go with the standard modern version Series 80 Colt Commander in stainless. Reasonably inexpensive by 1911 standards and tried and true manufacturer.
