 The primary difference between the M951R and the original M1951 lied in the fire selector lever mounted on the right side of the weapon's frame, enabling either semi-automatic or continuous fire – labelled "SEM" and "AUT", respectively.Additionally, the weapon has a heavier slide, a folding wooden forward grip, the barrel was extended, and so was the magazine, increasing capacity to 10 rounds.It is reported that the Inglis Company manufactured or converted Inglis made Hi-Powers and were reportedly used by the SAS during the Cold War as the British Army were using Inglis made Hi-Powers before adopting the L9A1 version of the Hi-Power in 1966.