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| Ruger P-85 Mark II (click to embiggen) |
The original Ruger P-85 had a situation where the firing pin could break and the hammer-dropping safety could thereby cause an unintended discharge.
The fix was adding a block that rotated into place between the hammer and firing pin as the safety lever was manipulated. It was retrofitted to existing pistols and new ones that came from the factory with the improved lever, as well as a few upgrades derived from the military's XM10 handgun trials, were sold as the P-85 Mark II.
Additional improvements to the pistol resulted in the Ruger P-89, which I've written about here and there. Matt at Hipster Tactical has a great deep dive on the P-89 and its antecedents here.
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