ULTIMATE Metal Hop-Up Unit - M4/M16

by ASG
SKU 16635
  • A full metal hop-up unit from Ultimate.
  • Features an innovative o-ring that improves the seal between the front of the gearbox and the hop-up unit.
  • The adjustment mechanism must be assembled by the user and offers a nice tight adjustment once fully assembled.
  • Maintains the hop-up setting extremely well.
  • Suitable for all M4 variants with standard hop-up units.

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