Our good old RetroArms hop Up chamber for AR15s with recently finetuned main shaft and feeding shaft drilling.
The chamber is machined on a precise CNC machine from aviation-grade aluminium EN AW 7075, is anodized and even though the chamber doesn't have any extra adjustable features such as feeding regulator etc., it is already R-hop ready and it's a powerful upgrade part machined with tight tolerances.
On a feeding shaft, you can find an o-ring, which prevents unfired BBs from falling out when reloading.
Another feature is a collet nut instead of a centering ring in the front of the chamber. When the collet nut is tightened, it holds the inner barrel and the chamber centered and tightly together and thus mitigating any movement of the barrel. Just make sure that you do not let the barrel rotate in the chamber when you tighten the nut. Another advantage of this nut is that it can hold barrels with different outer diameters (typically 8.4 - 8.5 mm).
Recent fine tuning of the main shaft and feeding shaft ensures compatibility with most HopUp rubbers and improves feeding reliability and consistency of the chamber.
Hop Up Chamber BASIC is designed for players, who want a 100% reliable and precise Hop Up chamber that just works without necessity to tune anything.
