Because it is an open breech design your never going to totally get away from the blow back. The rifle was originally made to shoot #11 caps. Then it sounds like the different ignition system was installed. The LK-93 is a Wolverine. It might not be the top of the line but it is a meat and potatoes rifle and they are good shooters.

Also you have a Timney trigger on that rifle. When you clean the rifle, there is one screw holding that trigger assembly on the bottom of the rifle. Take that assembly off (don't loose the screw) after you have pulled the back end cocking mechanism out of the rifle. Then get some brake cleaner. Take that outside and spray all the fowling out of it with the brake cleaner. If you don't, eventually it will seize up and you will not be able to pull the back cocking lever open. Spray it off nice and clean, shake it a few times. It will be real cold from the spray. Then I like to take a little gun oil and puta drop on the top where the lever sticks up through it, and on the side where the spring is located.. it will keep the trigger nice and smooth and crisp and make the rifle function real nice.

When you break the rifle down its, remove cocking mechanism, take trigger off, then pull the breech plug. And it goes back together just the other way.

Call Knight rifle and they will send you a manual for the rifle.