Scalar Pixie + RetroArms / RetroArms Pro · 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.

Available Variants

• Scalar Pixie + RetroArms: Designed for installations using the RetroArms hop-up chamber.
• Scalar Pixie + RetroArms Pro: Designed for installations using the RetroArms Pro hop-up chamber.

Installation and Adjustment

1. Part Preparation
   Make sure the selected files match your hop-up chamber. Remove any printing residue and lightly sand the contact surfaces if necessary to improve the fit. Do not force the parts together.

2. Assembly
   Position the Scalar Pixie engine and hop-up chamber with the inner barrel in the designated mounting locations of the kit. Install the mounting components according to the manual for the selected variant. Make sure the HPA line is not pinched.

3. Final Inspection
   Before connecting the air supply, verify that the nozzle is properly centered relative to the hop-up chamber and that there are no obstructions or interference. Check that the entire assembly is properly seated before performing functional tests.

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. This recommendation does not automatically guarantee compatibility with every configuration.