Well to start off according to the recently abandoned model lettering system the F is for synthetic, the C is for detachable box magazine, and the P is for law enforcement series of rifle. Not sure about the K.
Here's a link to the model designations
http://www.savageshooters.com/conten...r-Designations
An accutrigger model will have a center blade that has to be depressed in order for the sear to fall and is clearly visible on these models. There have been a bunch of model 10s produced in so many configurations that the "letter designations" can get lost quickly in the shuffle. for instance there is a model 10TR that was made a few years ago that comes with the accutrigger, accustock with a wide beavertail fore end, heavy threaded barrel in a couple of lengths both fluted and unfluted, oversized bolt handle, scope base, and the letter designation of TR is nothing I've found as a useful description and i'm not sure the Savage website ever cataloged this model. Maybe as with many other models it was an uncatalogued distributor exclusive. ( a lot of these exist to further muddy the water)
The only way I know of to ID an accustock is to remove the action and have a look to see if theres an aluminum bedding block. though the rifles I've seen with plastic around the magwell have never been accustock models.
If you find a rifle you like at the right price I wouldn't get too caught up on the letter designation as even old plain jane flatback rifles (older models with a flat spot milled below the rear scope mount) from years gone by can be some real head turners at the range.
Good luck and hope this helps.
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