It is called the Counter-Rotating Ring Receiver Reactor Recuperator, or CR5. It weighed , which included a compact, recuperator. Pressure in the recuperator reached 45 Bar. The buffer is a cylinder hydraulic with a hydro-pneumatic recuperator. Of these parts, only the recuperator and front trail weighted over . It retained the recuperator above the barrel. The recoil system consisted of a hydraulic buffer and hydro-pneumatic recuperator. The recoil system consisted of a hydraulic recoil buffer and spring-driven recuperator. The gun was equipped with a hydraulic recoil buffer and hydropneumatic recuperator. In practice, a doubling of efficiency is possible through the use of a recuperator. The variable length recoil system consisted of a hydraulic recoil buffer and hydro-pneumatic recuperator. It was equipped with a horizontal sliding block breechblock, hydraulic recoil buffer and spring recuperator. The buffer was mounted centrally in the cradle, between the two springs of the recuperator. Leyland's use of a recuperator improved this considerably, but proved a maintenance problem. The term "recuperator" refers to a separated-flow, counter-current heat exchanger.