If it has a 22" barrel, lookon it and see if it does not read LK-II. If it does it is a Knight Wolverine II LK-93. The rifle has a 1:28 twist Green Mountian Barrel. The knob on the back is a second safety on the rifle. In order to fire the rifle, besides the side safety being in the fire position, you must unscrew that knob as far back as it will go. On mine just showing red will still not fire it. Screw that know all the way to the back and it will fire off the primer.

You might give Knight Rifles a call and see if they will not send you a manual for the rifle. That is a great shooting rifle. Load about 80 grains of FFFg powder and a 240 grain T/C Mag Express XTP or 250 grain Barnes Expander and the accuracy will amaze you.

If that is the rifle in question and you need any other questions answered, feel free to PM me. I'd be more then glad to answer any questions about the rifle for you...