Disclosed herein is a method of manufacturing a method of manufacturing a set of integral gun barrels, the method comprising: a first step (103) of machining a single metal block to form a barrel preform having the finished outer shape of at least a first gun barrel and a second gun barrel, wherein the barrel preform has a solid cross section comprising a first barrel section and a second barrel section; and a second step (105), which is performed after the first step, of machining a coaxial bore in each of the first and second barrel sections of the barrel preform to form a first gun barrel and a second gun barrel, respectively.
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