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You probably mean 'selector'. It's a toggle switch on a double barreled shotgun that allows a shooter to choose which barrel fires first. This is especially handy when hunting, because you can select a barrel that corresponds with your distance to target using two different chokes. Chokes are constrictions at the end of the barrels that determine the grouping of the shot--and therefore their effective range--so having two different settings in one gun allows you to have two different ranges available with the switch of a button.
What else can I help you with?
Where can you find parts or parts drawings for a Frank Hollenbeck The Three Barrel Gun Co gun The seletor and lock parts that fire the rifle barrel are missing as well as butt plate and forearm?
Doubtful you will be able to find any. You can try want ads, gun shows, internet searches. Most likely you will have to have them made. The price might exceed what the firearm is worth.
Does a speaker selector only allow you to use one set of speakers at a time?
It can depend on how it is wired. Generally one would assume that a speaker seletor is for one set of speakers. It is possible to wire a selector to connect more than one set, but one should be aware that if putting speakers in parallel the impendence will be lowered, e.g. two 8 ohm spks in parallel will equal a 4 ohm load or appx half the original value, if the load gets to low, e.g. 2 ohms or less, the load can look like a short across the speaker terminals and cause the amplifier overload and burn out the output.
