Complex sentence: The internal design is derived from the basic Mauser action with a slight recoil of the barrel enabling the locking piece under the lightweight bolt to drop out of engagement and borrows from the later Westinger (rather than the Nickl) selector mechanism.
Split into simpler sentences: The internal design is derived from the basic Mauser action, with a slight recoil of the barrel enabling the locking piece under the lightweight bolt. This enables the bolt to drop out of engagement and borrows from the later Westinger (rather than the Nickl) selector mechanism.