RetroArms Pro CNC Hop-Up Chamber for M4 Series

The RetroArms Pro hop-up chamber is a slightly redesigned version of the Basic chamber, CNC-machined from aircraft-grade EN AW 7075 duralumin and anodized. It is R-hop ready and intended for setups with fitting, release or magazine feeding problems.

The height of the feed axis is adjustable in 0.2 mm steps using the included washers, and the front collet nut firmly secures the inner barrel in the chamber, eliminating play.

Features

• EN AW 7075 CNC-machined aluminum construction, anodized
• R-hop ready
• Adjustable feed axis, with included washers (0.2 mm steps)
• O-ring on the feed axis that stops the last 4 BBs from falling out on reload
• Collet nut instead of a centering ring for firm barrel fixation
• Accepts barrels with different outer diameters (usually 8.4-8.5 mm)
• Compatible with most hop-up buckings, with reliable and consistent feeding
• Compatible with M4/M16 series electric rifles

Specifications

• Weight: 10 g

After assembly and adjustment, it is recommended to secure the feed axis with medium-strength thread locker. When tightening the nut, do not let the barrel rotate in the chamber.