Maxx Model M4P Pro Hop Up Chamber - HPA Polarstar Speedloader This is a non-linear spring

This is a non-linear spring utilizing Japanese made steel spring material

The all-steel trigger mechanism vastly improves the durability of the trigger mechanism

△ Dimensions: length 139

03 Upgraded Inner Barrel

Maxx Model M4P Pro Hop Up Chamber - HPA Polarstar Speedloader This is a non-linear springThe newest Maxx M4P Pro HopUp Chamber for HPA PolarStar Engines on standard M4 M16 platforms. The CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) blue unit is precisely made to improve accuracy and ensure consistent air seal for all HPA PolarStar Engines on standard M4 M16 platforms. **The M4P unit is updated for 2022 and replaced the previous older red ME unit. The M4P includes more precise improvements including accepting more hopup