Installing the 452 trigger assembly is difficult. - RUG 90461 ELITE 452 MSR TRIGGER

When trying to fit the retaining pin holding the trigger assembly there is a small second piece holding the tiny spring in place. It is very easy for that piece to slip out of place when trying to line everything up to fit the retaining pin in place. You will not know it is not in place unless you turn the lower unit upside down and it falls out. If the pin does not fit through that piece the rifle will fire, eject the spent cartridge, but fail to latch the hammer