BB --
The main difference between these two pistols is that the 80 will have a firing pin safety, and the 70 will probably have the "accurizer" bushing. For carry, go with the 80, since the firing pin safety is an asset in that role, and a solid bushing is better for reliability. If you plan to have it built into a bullseye pistol, the 70 is probably the better choice, since it's simpler to do a good trigger job on it, and the bushing will get jettisoned anyway when the smith fits the barrel. I believe the 70s also still had the lightened slides for better functioning with wad loads. -- MD