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CHAPTER IV
GUN BARREL INDEX
1. This chapter is likewise arranged by caliber, but within each caliber the ,arrangement is by gun barrel Mark and Modification. Within each gun barrel Mark and Modification group the assemblies are subdivided and arranged by mount Mark and Modification.
2. When a mount or turret assembly has two or more gun barrels, the barrels sometimes have different Marks or Modifications. Thus, when the arrangement by gun barrel Mark and Modification is made, the barrels of such assemblies will not fall together but will be listed with the barrels of the same Mark and Modification. This means that an assembly may have its gun barrels in two or three different parts of the Gun Barrel Index if they bear different Marks or Modifications. In such cases it is necessary to refer to the Assembly Number Index (Chapter IT) for complete information on the particular caliber and assembly.
3. The 20 mm, 11:10, or 40 mm assemblies are not included in the Gun Barrel Index as they would be identical, with the Mount Index, since all of the gun barrels within each caliber are the same.

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