ASG ULTIMATE AIRSOFT M4 M16 AEG ALUMINUM ONE PIECE HOP UP CHAMBER

CONSTRUCTION: ALUMINUM COMPATIBILITY: DESIGNED TO FIT MOST M4 / M16 METAL BODIES. THIS HOP-UP UNIT WILL FIT PLASTIC BODY M4 / M16S WITH SOME SLIGHT MODIFICATION. PACKAGING INCLUDES: HOP-UP UNIT, ADJUSTMENT WHEELS, TENSION SPRING FEATURES ALUMINUM PRECISION CUT DESIGN EXTERNAL O-RING GEARBOX SEAL ONE PIECE UNIT