I have owned three Colt Gold Cup Trophies and all were excellent guns.
The GCT are a custom shop made gun and have been since 1997, Gold Cups before this were not. Current GCT's have much tighter tolerances than the series 80's Gold Cup.
There is no plastic parts on the gun, or MIM parts for that matter. Colt uses cast parts for some internals. The trigger BTW is a King's, which is not as wide as the traditional Gold Cup trigger, but is much wider than the standard 1911.
For the money the Gold Cup Trophy is a very good gun, and excellent shooter and looks very nice in both blue and stainless.
In Comparing the models the GCT is much better than the series 80's GC's, is better looking than the 70's series GC with the larger role marks and compares a close second to the pre70 National Matches.
I have owned all of them, 2 1960 National Matches, 1 1959 National Match, 1 1969 National Match, 2 70's Gold Cups, 1 80's Gold Cup, and 3 Gold Cup Trophies and has far as quality, tolarances and appearance nothing beats a pre70's National Match, followed by the current Gold Cup Trophies, then the 70 series GC, and last the 80's GC.