Is the 982 identical to the Pardner Protector (save for the GHS of course)? If so, then a Rem 870 Knoxx should fit on the 982 since I have one on my Protector. Fits like a glove.
And pay no attention to the second poster, it just means he was using it wrong.
If you get any cheek slap, it means you have it in one notch too close (even says so in the instruction manual). Take it out a notch and you won't get slapped and you'll have a better sight picture. Just the stocks way of telling you that you're doing it wrong.