Umbrella Armory MaxxPro Hop-up chamber assembly with 6.05 R-Hop barrel 247mm

Umbrella Armory offers a compatible assembly for M4 platform replicas consisting of a modified Prometheus 6.05mm barrel for R-Hop, a blue soft Madbull bucking, and a MaxxPro hop-up chamber.

The 6.05mm Prometheus barrel is modified and has R-Hop installed to provide improved accuracy, increased range, and better consistency. The R-hop system is hand-made and offered as version 2.0 by Umbrella Armory.

The blue soft Madbull bucking is manually modified and compatibility may vary depending on the length of the air nozzle.

The hop-up chamber is the result of a collaboration between Umbrella Armory and Maxx Model. It is specially designed to be used with modified R-Hop barrels. The nub is straight and different from the nub commonly used in ME chambers. This nub is used to apply the correct pressure on the center of the R-hop patch. This chamber does not support the standard bucking and barrel configuration and it is recommended to use a straight bucking with R-Hop modified barrels, as the hop-up adjustment wheel does not allow the arm to lower as much as in ME chamber models, to prevent damage to the R-Hop patch. However, these modifications allow for a more precise hop-up adjustment.