Only if they are in the car.
Lo-Jack is a battery powered radio transmitter that is permanently installed in a car, truck, or large pieces of construction equipment. When activated by police, it transmits a signal to allow police to locate it. Unless you have a REALLY big firearm, would be pretty hard to install a Lo-jack unit.
Y Only if it has been stolen/used in a crime and entered in the database.
If you are in the US, there is no central registration to keep track of a gun's current or previous owners. The police can check some databases to find lists of firearms reported stolen, but many cannot be identified because the person who owned it didn't know the serial number (and often not even the manufacturer, model or even caliber).
'Lo-Jack' is not used for traffic violations and giving tickets. It is strictly an emergency method for locating stolen cars.
A GPS system purchased by consumers for the purpose of driving directions cannot be used to track stolen cars because these GPS systems work by receiving satellite signals for the purpose of tracking location but cannot transmit signals back to a receiver. If you are interested in a device that be used to track stolen cars you could look into car services such as OnStar, Assist, LoJack, or other car specific gps tracking services that come pre-installed into the vehicles. http://www.clublexus.com/forums/gs-third-generation/475105-does-gps-track-car-if-stollen.html
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I'm not sure if that question can be answered accurately because there is no way to track the reason someone purchases a gun. Someone can buy a firearm designed for hunting, but use it for some other purpose.
It still is being used
Iphones are being used to track down people other Iphones that may have been stolen, and even more. They are used to play games and text and call. They are also used to facetime.
Yes you can, if you have a GPS or other tracking device installed inside it. Sometimes it may be possible to trace a stolen laptop or computer if it goes online via the internet, in the same manner organisations track pirated copies of their software on your system. There are also software you can download onto your laptop discreetly, for a price, to track its location and how it's being used by others.
Yes for modern firearms.
Tracer rounds used in firearms are typically red or green in color.
There are a few different types of magazines used on firearms. Two types of magazines for firearms are box magazines and drum magazines.