Abstract: A drift tube assembly including a drift tube having a cylindrical main body and a mounting cuff extending from the main body and defining a mounting socket. A mounting device is disposed within the mounting socket and includes an inner sleeve having a tapered exterior surface, a tubular outer sleeve surrounding the inner sleeve and having a tapered interior surface engaging the exterior surface of the inner sleeve, and a nut surrounding the outer and inner sleeves and including a flange extending into a groove formed in an exterior of the outer sleeve, the nut threadedly engaging a threaded portion of the exterior surface of the inner sleeve. A mounting rod extends into a passthrough of the inner sleeve of the mounting device. Tightening the nut causes the inner sleeve to tighten against the mounting rod and causes the outer sleeve to tighten against the mounting cuff.