Interrupted Thread - A screw with about half of its threading removed in longitudinal sections. Often used at the breech end of a takedown firearm's barrel. When the barrel's interrupted female threads are inserted into the receiver's complementary interrupted male threads, only a partial rotation is necessary for assembly---rather than many full turns.
With interrupted threads, the two-barrel set above allows switching barrels with only 1/3 turn---not even requiring removal of the scopes. Without interrupted threads, the two-barrel set below requires about seven full turns---and removal of the scopes.
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