HK Fossil - Eclipse CS3 - Mercury Freak Barrels & Inserts Fully engraved markings to match

Fully engraved markings to match the real thing

With both spiral and linear porting

Designed for longer range & accuracy

Mechanism: Pre-charged Pneumatic

but they stay secure as the strap locks strongly into place without shifting

HK Fossil - Eclipse CS3 - Mercury Freak Barrels & Inserts Fully engraved markings to matchMeet the HK Fossil Eclipse CS3 which offers more, across many aspects of its design. Let's start with the NEW OP Core drivetrain. With its Industry First Fully Double Decoupled drive (FDD), and integrated auto dwell dynamics (ADD) it provides supreme consistency, efficiency and reliability, in our most powerful and intelligent spool drive assembly to date. Its 50% increase in valve chamber volume enables the OP Core to operate at an insanely low