MADBULL ULTIMATE HOP UP UNIT M4 / AR
SKU : MBHOPM4
New hop-up design by Mad Bull for M4/M16 AEG
Features o-rings for enhanced air seal and hop-up dial for easy adjustment.
Chamber seal around the hop-up tube locks in the BB's, and prevents BB's from dropping during mag changes.
Compatible with new Mad Bull LED Tracer
Recommended for experienced users.