P95 is the model number. DC means it has a decocker.
350 USD
You will have to contact Ruger
$250-$400, depending on condition and finish.
It hasn't been since at least 2003
You can request an owner's manual from Ruger. You can go to a gunsmith and ask for help also.
For a definitive answer, you will need to check with Ruger customer service. You can do so through their website.
Neither. "Better" depends on what you think, not someone else.
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Part failure/out of spec. Get it to a qualified gun smith ASAP.
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