WHAT IS THE DIFFERENCE BETWEEN DA/SA AND LEM TRIGGERS?

The HK P30 DA/SA pistols function like any other DA/SA; the first shot is a longer, heavier double action pull, while subsequent trigger pulls will be shorter and lighter – the DA/SA P30s have a decocker in the rear of the pistol.

The LEM system, in contrast, is similar to a DAO action, where every trigger pull will be the same weight and length – the LEM system does not have a decocker.