Although Warrant Officer and NCOs of the Royal Artillery wore the same rank badges as the rest of the army, their function and relative appointments varied considerably.
The Warrant Officer rank, established in 1879, at first applied only to Conductors of stores and supplies. In 1881, Staff Sergeants class I, Master Gunners Class I and II, Brigade Sergeant-Majors and Quartermasters. (including Brigade Wheeler, Collarmaker and Farrier Sergeant-Majors) were raised to Warrant Rank. Although this new group adopted the Warrant Officer rank, they were not at the same level of Conductors.
As mentioned before Master Gunners Class 1 of Coast Brigades had been Warrant Officers since 1861.
Master Gunners Class I & II wear the Crown above the Gun on the right lower sleeve while the Master Gunner Class III simply wears the Gun.
Perhaps not to confuse the rank badges of Master Gunners with other WO ranks, The Brigade Sergeant-Majors and associated ranks wore four bar chevrons, points up, below the elbow. The Brigade Quartermaster had the 8 pointed star between the chevrons and the Gun.
Other appointments with this rank were, Farrier, Wheeler, Collarmaker-Majors.