I own and have owned quite a few and they are excellent rifles. The disc and disc-extreme was Knight's step into a so called closed breech or sealed primer. Problem I have encountered is the one stated by simonkenton In the process of using the discs, you had to make sure your alignment was perfect or your striker would not contact the primer. Since then, they have pretty much gone to a true closed breech as other have done and glad of it as did not appreciate seeing the ground littered with the discs. They are well made in just about every way. However, if you are looking at buying one, shop around and see if you can do better on price and features.
Be Safe !!!
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