Yeah, I'm willing to bet that is the case. My remington has a set of buffer rings that can be adjusted to the round. I do know my buddy bought an 11-87 and shot 3 1/2s without doing anything but assembeling the gun and it jammed on his first shot... we cleared the jam and on the 2nd shot it jammed again. I'm wondering now if not removing that ring caused the weapon to jam that way.