An adjustable plasma spray gun system, comprising: an adjustable plasma spray gun apparatus comprising an electrode; a first coupler an electrode body housing said electrode; a plasma spray device body having a fore portion and an aft portion, the aft portion having an axial opening configured to removably attach to one of the electrode or the first coupler; wherein the first coupler is removably attached to the plasma spray device body at the axial opening of the plasma spray device body, the first coupler including: a first portion having a first axial opening configured to removably attach to the plasma spray gun body; and a second portion having a second axial opening configured to removably attach to one of the electrode body or a second coupler; an adjustable gas distribution assembly (900,1000) within the plasma spray device body, and wherein said adjustable gas distribution assembly (900,1000) includes a positioning ring and a first distribution ring (910, 1010) detachably coupled one to the other; wherein said first gas distribution ring (910,1010) has a plurality of openings (930,1030) allowing a gas to pass to an inner diameter thereof, and includes a mating surface (920,1020) upstream of the plurality of openings (930,1030); wherein said positioning ring is axially aligned with and between the first gas distribution ring (910,1010) and the electrode; wherein the positioning ring includes a mating surface that mates with the mating surface (920,1020) of the first gas distribution ring (910,1010); wherein the adjustable gas distribution assembly (900,1000) is arrangeable in fluid communication with a nozzle at an axially downstream end of the adjustable gas distribution assembly; wherein said first distribution ring (910,1010) is replaceable by one of a plurality of distinct gas distribution rings (910,1010); wherein said positioning ring is for detachable coupling with each of the plurality of distinct gas distribution rings (910,1010); wherein each of said distinct gas distribution rings (910,1010) has a plurality of openings (930,1030) allowing a gas to pass to an inner diameter thereof, each of said distinct gas distribution rings (910,1010) including a mating surface that is compatible with the mating surface of the positioning ring, said mating surface being axially upstream of the plurality of openings (930,1030); and wherein said openings (930,1030) of each of the gas distribution rings have a distinct inner diameter from the inner diameter of the other openings of the other gas distribution rings, allowing for a distinct amount of gas to pass the respective inner diameter thereof. an adjustable plasma spray gun apparatus comprising an electrode; a first coupler an electrode body housing said electrode; a plasma spray device body having a fore portion and an aft portion, the aft portion having an axial opening configured to removably attach to one of the electrode or the first coupler; wherein the first coupler is removably attached to the plasma spray device body at the axial opening of the plasma spray device body, the first coupler including: a first portion having a first axial opening configured to removably attach to the plasma spray gun body; and a second portion having a second axial opening configured to removably attach to one of the electrode body or a second coupler; an adjustable gas distribution assembly (900,1000) within the plasma spray device body, and a first portion having a first axial opening configured to removably attach to the plasma spray gun body; and a second portion having a second axial opening configured to removably attach to one of the electrode body or a second coupler; an adjustable gas distribution assembly (900,1000) within the plasma spray device body, and wherein said adjustable gas distribution assembly (900,1000) includes a positioning ring and a first distribution ring (910, 1010) detachably coupled one to the other; wherein said first gas distribution ring (910,1010) has a plurality of openings (930,1030) allowing a gas to pass to an inner diameter thereof, and includes a mating surface (920,1020) upstream of the plurality of openings (930,1030); wherein said positioning ring is axially aligned with and between the first gas distribution ring (910,1010) and the electrode; wherein the positioning ring includes a mating surface that mates with the mating surface (920,1020) of the first gas distribution ring (910,1010); wherein the adjustable gas distribution assembly (900,1000) is arrangeable in fluid communication with a nozzle at an axially downstream end of the adjustable gas distribution assembly; wherein said first distribution ring (910,1010) is replaceable by one of a plurality of distinct gas distribution rings (910,1010); wherein said positioning ring is for detachable coupling with each of the plurality of distinct gas distribution rings (910,1010); wherein each of said distinct gas distribution rings (910,1010) has a plurality of openings (930,1030) allowing a gas to pass to an inner diameter thereof, each of said distinct gas distribution rings (910,1010) including a mating surface that is compatible with the mating surface of the positioning ring, said mating surface being axially upstream of the plurality of openings (930,1030); and wherein said openings (930,1030) of each of the gas distribution rings have a distinct inner diameter from the inner diameter of the other openings of the other gas distribution rings, allowing for a distinct amount of gas to pass the respective inner diameter thereof.