RetroArms Ultra CNC Hop-Up Chamber for M4 Series

The RetroArms Ultra hop-up chamber is the complete solution for players who want a fully customizable chamber. It is based on the Basic chamber, CNC-machined from aircraft-grade 7075 aluminum, and has an adjustable feed axis like the Pro version.

The nozzle axis is adjustable, so the chamber can be positioned further forward in 0.2 mm steps using the included washers, to tune feeding or the position relative to the magazine. This feature requires nozzles of different lengths.

Features

• 7075 CNC-machined aluminum construction
• Adjustable feed axis
• Adjustable nozzle axis, with washers for 0.2 mm steps
• New inner barrel fixing mechanism: redesigned POM C-clip and Dutch nut that center the barrel and prevent rotation or longitudinal movement
• Flat area at the hop-up bucking, with included rings for standard AEG buckings (adjustable by sanding)
• Compatible with the new robust RetroArms hop-up bucking
• Compatible with M4/M16 series electric rifles

Specifications

• Weight: 10 g
• Maximum outer diameter of the Dutch nut: 12.95 mm

The Dutch nut is tightened by hand only. Before purchase, check that the nut fits inside the replica's outer barrel.