Colt uses a 1 turn in 14" rifling twist.
This faster twist is one reason for Colt's reputation for better accuracy.
The Peacekeeper is an unpolished, black finished Colt Trooper Mark V.
When Colt did a slight redesign of the Trooper Mark III, the resulting gun was known as the Trooper Mark V.
The difference between the Mark III and the Mark V was, the Mark V had:
A new barrel with vents in the rib.
A new cast steel hammer and trigger, which was Colt's first "short action".
A longer mainspring with a relocated seat.
A rounded butt frame.
These changes were intended to improve the trigger pull and update the appearance.
In 1985 to 87, during the big Colt strike, Colt didn't have enough polishers still working to enable them to keep production up.
So, Colt introduced a series of unpolished, black finished revolvers.
The Commando which was an unpolished Detective Special.
An unpolished Cobra and Agent.
And an unpolished Trooper Mark V made as the Peacekeeper.
Internally, the Peacekeeper was as well finished as the polished Mark V, but had a rough black finish and Colt medallion-ed Pachmayr Gripper rubber grips.
These unpolished guns were not very popular, and as soon as the strike ended, they were discontinued.
Later in the 1980's, Colt added a new profile barrel to the Mark V, made it in stainless and blued steel and sold it as the King Cobra.
Like all the Trooper Mark III, Mark V, and King Cobra guns, the Peacekeeper is an extremely strong, durable gun.
As in all these guns, the only "weakness" is that a few gun "may" have a firing pin that's too hard, and "might" break if the gun is dry fired too much.
The fix for this is to use snap caps.
This should be done, since a broken firing pin is a factory replacement ONLY, as the job requires special tools to prevent damaging the frame.