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Originally Posted by William
Beats me, my sources are the same as yours.
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Caliber is the diameter of the bore expressed in inches.
In naval terms it's used in the context of the length of the barrel compared to the diameter of the bore:
A 4/75 caliber gun is a gun with a 4" diameter bore and a barrel 75 calibers (75x4=)300" long.
Technically .45 caliber and .38 caliber (caliber implies inches and thus no need to state) are correct, and 9mm caliber or 12.5mm caliber... or 15mm caliber... are not tho modern usage often ignores the distinction.
ETA: Given difficulties with translation it's chancy to assume that's the case here but they context would seem to support a 15mm aperture.
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What this laser gun is probably intended for: inflicting horrific burn injuries and blindness on unarmed demonstrators.
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Fair bet. Even the M1 Abram's laser rangefinder can be used to blind unprotected persons at over 2000 yards, and it's 40 year old technology. Judas Priest I'm getting old.