This hop unit was designed to allow easy manual chambering of aspherical rounds, specialty rounds, and for nozzle-bucking compression testing in th...

This hop unit was designed to allow easy manual chambering of aspherical rounds, specialty rounds, and for nozzle-bucking compression testing in th...

Designed to work on Prometheus, Madbull, and PDI barrels, this circular shim can be wedged in between the inner and outer barrel to prevent wobblin...

Designed to work on most barrels, this circular shim can be wedged in between the inner and outer barrel to prevent wobbling and accuracy loss. It ...

BASC Custom Hop-Up Arm w/ integrated spacer. At the moment it is just a prototype: print at your own risk! Visit http://basc.ch for future updates ...

This is an installation aid which helps with the installation of the R-hop. This product has been vetted and found to be highly effective. Instruct...