Hop Unit Parts

The standard nubs for the MDR-X that are included are not the best. The short nub struggles to apply much pressure at all and the high nub is a poor fit and could be better.

The Jaeger Precision Nub has refined dimensions as well as a concave contact p

CNC Aluminum Hopup Chamber M4i Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently on ICS CXP/CS4/EBB (include old models) M4/M16 AEG series.
The Hopup Chamber M4i unit is built with an aluminum Rotary Dial Kno

Flat Type Hop-Up Tensioner

Flat Type Hop-Up Tensioner Bridge Type