Fella down the road has a Thumbhole stock for a knight. When he bought it 5-6 years ago it came with 2 stocks. He is willing to sell the other but doesnt know what model knight he has. I have a disc elite and was wondering if anyone knows if this would fit and what it is worth $ wise. Should I just take my barrel off and see if it will fit? Dont want to mess anything up. Thanks Kerry