See the Blue Book of Gun Values
You need the services of a gunmsith.
100-300 or so
Yes
No. They are two different magazines
There are several handguns made by Taurus with a PT designation... you would have to specify specifically which one (PT92, PT99, PT101, etc.). General rule of thumb.. for a firearm in good condition, used, you shouldn't expect more than 10% depreciation from the price of a new one.
I don't have my value guide in front of me, but new, I sell them new for $399. If it is used but in really good shape, I'd guess $250 - $300.
Call Taurus' Customer Service.
100-500
Yes there is
Pistol, Tarurus
Check with Taurus Customer Service at their website.
100-450 USD