Retro Arms CNC Hop-Up Chamber, Basic, M4, Black

Looking for a hop-up chamber that delivers stable performance and precision without constant fine-tuning? The Retro Arms CNC Hop Up Chamber AR15 BASIC is the updated version of the classic, solid chamber. Retro Arms has recently refined the bores for both the main axle and the feed channel, making this chamber a reliable and precise upgrade for your M4/AR15 setup.

Precision-machined from EN AW 7075 aircraft aluminium

Retro Arms does not compromise on tolerances, and the BASIC model has a number of well-thought-out features:

• Refined for reliable feeding: The optimised internal bore is compatible with almost all common hop-up buckings on the market. This improves the air seal and gives a very consistent muzzle velocity and reliable BB feeding.

• R-Hop ready: Although the chamber has a clean, functional design without unnecessary adjustment screws, the arm and chamber are designed to be fully R-Hop ready out of the box.

• Integrated O-ring in the feed channel: Tired of BBs rolling out of the bottom of the rifle every time you change magazines? A built-in O-ring in the feed tube holds loose BBs in place during magazine changes.

• Collet nut: Instead of a traditional plastic centring ring at the front, Retro Arms uses a CNC-machined collet nut. When the nut is tightened, the inner barrel and hop-up chamber are locked together solidly, eliminating vibration and play. The nut automatically adapts to barrels with an outer diameter between 8.4 mm and 8.5 mm.

Designed to perform – every time

The BASIC chamber is made for the player who simply wants a fast, precise chamber that works from the first shot, without spending hours on technical fine-tuning in the workshop.