For a definitive answer, you will need to check with Ruger customer service. You can do so through their website.
Yes they are. Almost all of the sport frames have interchangeable lenses.
350 USD
A Trans Am is a uni-body frame and the Malibu is a full frame. So absolutely not.
P95 is the model number. DC means it has a decocker.
You will have to contact Ruger
the front frame horns are different
No. Different platform.
$250-$400, depending on condition and finish.
It hasn't been since at least 2003
Considering the fact that the Trans Am is a unibody and the Malibu is a full frame car...NO
You can request an owner's manual from Ruger. You can go to a gunsmith and ask for help also.
200-1000 or so depending on specifics