Q: Is it worth Updating to the Knight Plastic Extreme Disc System?
A: The bolt on the extreme disc leaves a much larger opening when the bolt is closed which releases much more blowback on you, rifle, and scope.
The original disc works better for two reasons. With the flatter surface of the original disc it is easier to press in 209 primers. Also the bolt on the original disc rifle closes down on the disc tab doing a better job of keeping blowback contained.
Q: Pg.60 ml forum