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MAXX CNC Aluminum Hopup Chamber M4P PRO for PolarStar HPA Engines Reviews

4.7 Rating 21 Reviews
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MAXX - CNC Aluminum Hopup Chamber M4P PRO for HPA PolarStar Engines on Standard M4 Platforms
Includes:
1 x CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) unit
2 x CNC Acrylic Side Cover
2 x CNC Brass 2.5mm Side Wing
1 x CNC Steel Pivot Pin
1 x CNC Aluminum Hopup Lever
1 x CNC Aluminum Soft Round Nub
1 x CNC Aluminum Soft Flat Nub (4mm)
1 x CNC Aluminum Hard Concave Nub (4mm)
3 x Steel Nub Spring
1 x CNC Steel Spring Guide
1 x Steel Upper Compression Spring
1 x Steel Center Compression Spring
1 x CNC Delrin Locking C-Clip
1 x CNC Brass Barrel Spacer
1 x Brass Barrel Spacer Holder Oring
1 x CNC Aluminum Rotary Dial Knob
1 x CNC Aluminum Inlet Adaptor (OD 11mm)
Features: 
Machined from a solid aircraft aluminum block with tight tolerances to achieve the most accuracy, consistency, and durability
Performed accurately and consistently with HPA PolarStar Engines on standard M4/M16 platform
Precision Rotary Dial Knob for fine hopup adjustments
Re-engineered the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot
Removable Steel Pivot Pin for ease of setup and maintenance
Accepted the HPA PolarStar Engine M4 nozzle length
Fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use
Wisely equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore HPA Engine nozzle outlet without wobbling. (Inlet Adaptor OD11.5mm and OD12mm are sold separately)
Mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots
Included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting
Equipped with 2 compression springs on top and center to ensure the hopup unit is seated straight and air tight during use
Specially designed with a new BB Latching System to prevent BB dropping after removing the magazine
The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber
Compatible with any 11mm inner bore HPA Engine nozzle outlets
The Dual UV LED Tracer Module to glow BB in the dark ready!
Product Description:
CNC Aluminum Hopup Chamber M4P Pro (with BB Latching System) unit is precisely machined to perform accurately and consistently with HPA PolarStar Engines on standard M4/M16 platform.
The Hopup Chamber M4P unit is built with an aluminum Rotary Dial Knob for fine hopup adjustments, the precision Hopup Lever and 4mm Bucking Nubs (6mm Bucking Nubs are optional) to perform best with R-Hop and Standard-Hop to keep the BB shooting accurately and consistently on every single shot.
The Hopup Chamber M4P unit is designed to accept the HPA PolarStar Engine M4 nozzle length, and fully compatible with most aftermarket soft and hard rubber buckings without losing FPS or dropping BB during use.
The Hopup Chamber M4P unit is wisely equipped with an interchangeable Inlet Adaptor OD11mm to ensure the hopup unit is inserted exactly in the center of the 11mm inner bore HPA Engine nozzle outlet without wobbling. (Inlet Adaptor OD11.5mm and OD12mm are optional)
Also mounted the removable CNC Brass Side Wings to slide smoothly into the outer barrel slots, and included an advanced CNC Delrin Locking C-Clip to hold the inner barrel tight in place without wobbling and twisting.
More than that, the Hopup Chamber M4P Pro unit is specially designed with a new BB Latching System to prevent BB dropping after removing the magazine. The Latching Arm can also be manually pressed to release the remaining BB from inside the hopup chamber.
***The Dual UV LED Tracer Module is an add-on option to glow BB in the dark. Operating Voltage from 7VDC - 15VDC (2-4 cells LiPo, 6-13 cells NiCad). (Sold separately)
***Test results: FPS might be increased from 10FPS to 30FPS over the stock setup. Please check your FPS!
Product Specifications:
Overall Length: 51.15mm
Overall Height: 37.75mm
Inlet Adaptor Outer Diameter (to fit into HPA Nozzle Outlet): 11mm
Hub Outer Diameter (to fit into Outer Barrel): 12mm
Hub Inner Diameter (to fit Nozzle): 8mm
Feeder Outer Diameter (to fit magazine): 8.85mm
Feeder Length (to fit magazine): 6mm
Material: Aluminum 6061
Color: Black and Blue
Material: CNC Aluminum
Compatibility: PolarStar Engines on standard V2 Gear boxes
Manufacturer: MAXX Model Products
Recommended Compatible Products: 
Compatible with most HPA PolarStar Engines on standard M4/M16 platform
More About MAXX and why we carry MAXX:
Maxx Model Products, Inc. began in 2001 as a company known by Microheli.com based in Canada, we designed and manufactured high quality upgrade parts and accessories for RC Helicopters, Drones, and Cars. Starting in 2016, Maxx took its experience in high quality RC components and expanded to Airsoft. Maxx launched itself into the Airsoft market with the release of our original M4 PRO hop-up unit. Through feedback from the community and constant improvements, we have achieved the most advanced M4 hop-up unit with the ME model. Taking what we learned in that process, Maxx now brings our attention to other platforms. With our years of experience Maxx looks to manufacture more advanced and innovative products for the whole market. Maxx Model Products, Inc. is a registered business in Canada.

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Expensive but worth it! Thought I would have to make modifications, but it worked great from the start. I like how you can fine tune the hop-up. Much better than my lonex hop-up which was much harder to make accurate adjustments with. My set-up consists of a lambda barrel, modify bucking, and a P* fusion engine in a G&P body.
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Posted 1 year ago
Certainly one of the best hop ups on the market right now. Well worth it! Thank you for the review!
Posted 1 year ago
Very good fits with my polar star unit lines up perfectly with a AirTag upper and shoots lasers
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Posted 1 year ago
That's wonderful to hear! Thank you so much for the feedback! :)
Posted 1 year ago
my old g&g hop unit was shooting lopsided but this new hop unit paired with a maple leaf bucking makes for a consistent seal.
1 Helpful Report
Posted 1 year ago
That's great to hear that you enjoyed your experience! Thank you for the feedback and we will continue to do our best! :)
Posted 1 year ago
Best hopup I coulda bought
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Posted 1 year ago
That's wonderful to hear Dylan! Thank you. ❤
Posted 1 year ago
Author didn't leave any comments.
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Posted 1 year ago
We appreciate the review! Thank you. :)
Posted 1 year ago
Still fine tuning, lots of options. Able to hop much heavier BB's now.
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Posted 1 year ago
We are happy to hear that! Thanks!
Posted 1 year ago
i have this in a old kwa with a p* kythera and it is the best but it did not quite fit at first
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Posted 1 year ago
Recently I bought a g&p m4 that had the r3 system in it and it worked great. I decide to upgrade the hopup with a Maxx m4p hopup (says it's specific to polarstar products) and since then I have double feeding. Not exactly sure what's happening but I would like some answers to why it's double feeding now
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Posted 1 year ago
Hi! Please view the response we sent to your email. If you still need help please email us at sales@ampedairsoft.com
Posted 1 year ago