Firing Pin Block
An internal safety that blocks the firing pin until the trigger is fully pulled.
Also: firing pin safety
A firing pin block is a small spring-loaded plunger that physically blocks the firing pin from moving forward unless lifted by the trigger linkage. It’s the mechanism that makes a modern handgun drop safe — even if the hammer falls or the firing pin is jarred by impact, it cannot reach the primer until the trigger is deliberately pulled. Common in modern 1911 variants (Series 80) and in striker-fired pistols.