Specna Arms CNC Aluminum Hop Up Chamber M4A - PRO

The Specna Arms CNC Aluminium Hop-Up Chamber M4A-PRO is a high-quality hop-up chamber developed in collaboration with Maxx Model Products. This CNC-machined hop-up unit is designed for players seeking maximum precision, reliability and extensive adjustment options for their M4/M16 AEG. Thanks to its precision manufacture from 6061 aluminium, the M4A-PRO offers an excellent fit and stable operation of the hop-up system.

The hop-up chamber is compatible with Tokyo Marui-spec M4/M16 replicas, including models from G&G and Krytac. Replicas from KWA are not supported.

CNC-milled precision for optimum performance

The M4A-PRO is CNC-machined entirely from a block of 6061 aircraft-grade aluminium. This results in an extremely precise hop-up chamber with minimal tolerances and a stable fit within the replica.

The rotary adjustment knob allows for highly precise hop-up adjustment, whilst the redesigned hop-up arm and 4 mm nub construction ensure reliable operation with both standard and R-Hop buckings.

Maximum stability and reliable feeding

To ensure stable operation, the hop-up chamber incorporates various technical features. The Delrin Locking C-Clip prevents the inner barrel from moving, whilst two compression springs hold the hop-up unit firmly in place.

In addition, the M4A-PRO features an updated BB Latching System, which prevents BBs from falling out of the hop-up chamber when the magazine is removed. If required, the system can be opened manually to remove BBs from the chamber in a controlled manner.

Widely compatible and supplied as a complete set

The hop-up chamber is suitable for nozzles ranging from 21.00 mm to 21.25 mm and is fully compatible with most soft and hard hop-up buckings without any loss of FPS or unwanted BB drop-outs.

The set comes with a full range of items and includes, amongst other things:

• CNC hop-up chamber with BB Latching System
• CNC Hop-Up arm
• Soft Round Nub
• Soft Flat Nub (4 mm)
• Hard Concave Nub (4 mm)
• Delrin Locking C-Clip
• CNC Adjustment Knob
• 11 mm Aluminium Inlet Adapter
• Brass Side Wings
• Brass Barrel Spacer
• Pivot pin
• Compression springs
• Various spacers, springs and fitting materials

In addition, the hop-up chamber is designed to accommodate a BB Tracer Unit (not included).

Practical insights

A high-quality CNC-machined hop-up chamber ensures more stable positioning of the inner barrel and nozzle, resulting in a more consistent air seal. Thanks to the various nubs supplied, the user can adjust the hop-up to suit a range of BB weights and buckings. The combination of a rotary adjustment, Delrin C-clip and BB Latching System makes this hop-up chamber particularly suitable for players who wish to fine-tune their replica.

Who is the Specna Arms CNC Aluminium Hop-Up Chamber M4A-PRO suitable for?

The Specna Arms CNC Aluminium Hop-Up Chamber M4A-PRO has been developed for discerning airsoft players who want to get the most out of their M4/M16 AEGs. Thanks to the collaboration with Maxx Model Products, the extensive adjustment options and the high-quality finish, this hop-up chamber is ideal for both competitive builds and high-quality upgrades.

Key features

• Genuine Specna Arms PRO product
• Developed in collaboration with Maxx Model Products
• CNC-machined from 6061 aircraft-grade aluminium
• Suitable for Tokyo Marui-spec M4/M16 AEGs
• Compatible with G&G and Krytac
• Not compatible with KWA
• Rotary hop-up adjustment
• Suitable for standard and R-Hop buckings
• Suitable for nozzles measuring 21.00 to 21.25 mm
• Delrin Locking C-Clip voorkomt barrel movement
• The BB Latching System prevents BBs from falling out
• Two compression springs for secure mounting
• 11 mm CNC inlet adapter included
• Interchangeable Brass Side Wings
• Compatible with the BB Tracer Unit
• Includes several nubs and a complete fitting kit
• Material: CNC-machined 6061 aluminium

Common mistakes

• Check beforehand whether your replica is based on the Tokyo Marui M4/M16 standard, as the hop-up chamber is not compatible with KWA.
• When fitting, check that your nozzle is between 21.00 mm and 21.25 mm in length to ensure an optimal seal and performance.

Frequently Asked Questions

Which replicas is this hop-up chamber suitable for?
The hop-up chamber is suitable for Tokyo Marui-spec M4/M16 AEGs, including G&G and Krytac. KWA is not supported.

What material is the hop-up chamber made of?
The hop-up chamber is entirely CNC-milled from 6061 aircraft-grade aluminium.

Can I use R-Hop buckings?
Yes. The M4A-PRO is compatible with both standard buckings and R-Hop buckings.

What nozzle lengths are supported?
The hop-up chamber is designed for nozzles ranging from 21.00 mm to 21.25 mm.

Are nubs included?
Yes. The set contains a Soft Round Nub, a Soft Flat Nub (4 mm) and a Hard Concave Nub (4 mm), along with all the necessary fitting materials.

Upgrade your replica with the Specna Arms CNC Aluminium Hop-Up Chamber M4A-PRO and enjoy CNC precision, maximum adjustability and the high-quality performance developed in collaboration with Maxx Model Products.