It replaces the traditional fittings and line where it exits your grip

AL CNC w/ Type III Hard Anodized Handguard

Drop-in trigger ready

When combined with a short stroked trigger

LONEX AIRSOFT ALUMINUM MUSHROOM TYPE PISTON HEAD - ORANGE Sentinel Gears It replaces the traditional fittingsSPECIFICATIONS MATERIAL: STEEL, ALUMINUM RUBBER COMPATIBILITY: AEG GEARBOXES PACKAGE INCLUDES: 1X PISTON HEAD COLOR: BLACK ORANGE FEATURES CONSTRUCTED OF QUALITY ALUMINUM AND RUBBER. COMPATIBLE WITH AIRSOFT AEG GEARBOXES. CNC MILLED ALUMINUM PISTON HEAD BODY. HIGH DENSITY RUBBER PADDING TO REDUCE SOUND. PORTED DESIGN TO ENSURE MAXIMUM AIR SEAL. INCLUDES THRUST BEARING, O RING, AND BALL BEARING MOUNT. MUSHROOM TYPE HEAD PROVIDES COMPLETE AIR