I had one of the first models of knight rifles. I believe it was a LK-93. 120gr max pyrodex, and yes, I changed mine over to to 209 primer. I sold it last year for 120 dollars with the upgrade kit. Served me well for many years. I got 4" groups at 100 yards no problem, and found that if you bed that stock, you can get 2MOA easy. The cheap stock can be your problem.

Fine gun.