CNC machined aluminum M4P - PRO Hop-Up chamber (with bullet catch and release lever) is designed for standard M4/M16 rifles with HPA PolarStar. Due to the high quality and precision manufacturing, it eliminates air (pressure) leaks and thus increases performance. The pressure adjustment is done with a rotary ring that allows very fine pressure adjustment. The 4 mm pressure arm (6 mm can be purchased as a separate accessory) is compatible with R-hop and Standard-Hop rubber bands. The chamber is designed for Polarstar HPA nozzles and is compatible with most soft and hard hop-up rubber bands without any loss of performance.The M4P Pro chamber features a replaceable OD11mm inlet adapter that ensures the chamber is inserted exactly in the center of the nozzle inlet without wobbling (OD11 adapter.5mm and OD12mm can be purchased as separate accessories). The chamber also features a CNC barrel lock that holds the barrel firmly in place, preventing the barrel from rotating or wobbling. Another new feature is the brass side plates that slide into the grooves of the outer barrel and aid in centering the chamber. In addition, this chamber has a special ball catch with a lever, so youYou will not have any bullets fall out when you pull the magazine out (as is common with standard hop-up chambers). To release the marbles from the chamber you need to press the lever.

Overall length: 51.15 mm
Overall height: 37.75 mm
Outer diameter of the inlet adapter (to fit into the outlet of the HPA nozzle): 11 mm
Outer diameter of hub (to fit into outer barrel): 12 mm
Inner diameter of hub (to fit into nozzle): 8 mm
Outer diameter of feeder (for tray): 8.85 mm
Length of feeder (to tray): 6 mm

Includes:

1 x CNC aluminum M4P Pro Hop-up Chamber (with ball catch system)
2 x CNC acrylic side cover
2 x CNC brass 2.5mm side wing
1 x CNC steel swivel pin
1 x CNC aluminium Hopup lever
1 x CNC aluminium soft ochrehly tip
1 x CNC aluminium soft flat pressure (4 mm)
1 x CNC aluminium hard concave pressure plate (4 mm)
3 x steel spring
1 x CNC steel spring guide
1 x steel top compression spring
1 x steel middle compression spring 1 x steel middle compression spring spring
1 x CNC Delrin Locking C-Clip
1 x CNC brass barrel spacer
1 x brass barrel O-ring bracket
1 x CNC aluminum swivel knob
1 x CNC aluminum barrel input adapter (OD 11 mm)

Compatible with most HPA PolarStar engines on the standard M4/M16 platform.

Weight: 20g

Materials: Aluminum