hAkron
Member
From the Colt Trooper Wikipedia page
"It also vastly improved on the earlier design in durability, and offered the advantage of employing sintered iron internal parts rather than expensive forged ones. The sintered parts also allowed for improved fabrication tolerances, and could be given a special heat treatment resulting in a harder more wear-resistant composition. Using these parts virtually eliminated hand fitting, significantly lowering labor costs associated with the assembly and manufacture of the MK III line."
"It also vastly improved on the earlier design in durability, and offered the advantage of employing sintered iron internal parts rather than expensive forged ones. The sintered parts also allowed for improved fabrication tolerances, and could be given a special heat treatment resulting in a harder more wear-resistant composition. Using these parts virtually eliminated hand fitting, significantly lowering labor costs associated with the assembly and manufacture of the MK III line."