Scalar Pixie + PolarStar HopUp · Alignment Kit V2.1 · M4 AEG HPA

3D Printing Settings

• Estimated printing time: ~1 h 30 min, depending on the printer and settings.
• Filament: PLA+.
• Layer height: 0.10–0.15 mm.
• Infill: 65–80%.

Manuals

Installation and adjustment manuals are available in the Manuals section of the website or on the project's Discord server. Refer to the manual for this specific variant to identify the required parts and mounting hardware.

Installation and Adjustment

1. Part Preparation
   Remove any printing residue and inspect the contact surfaces. If necessary, lightly sand the surfaces to improve the fit without modifying the mounting areas more than required.

2. Assembly
   Install the Scalar Pixie engine and PolarStar hop-up chamber with the inner barrel according to the kit-specific manual. Make sure all components fit properly without excessive force and that the HPA line is not pinched.

3. Final Inspection
   Before connecting the air supply, check that the nozzle is properly centered relative to the hop-up chamber and that there are no obstructions or interference. Follow the engine and kit instructions for functional testing.

Recommended Lowers

Using an ICS metal lower is recommended, provided it is compatible with this configuration.

If you prefer a 3D-printable lower, you can check the following designs:

• Gearbox V2 Lower "Universal Lower" — Version 3.
• Gearbox V2 Lower "Universal Lower" — Version 4.2.
• Gearbox V2 Lower "Universal Lower" — Version 4.3 MTW.

You can find them HERE.

Review the mounting requirements for each version before choosing one. The M4 platform alone does not guarantee lower receiver compatibility.