I called the smith and he also claims tha the decelerator is made of a better material. Blowing smoke?
It's made of a harder rubber is the plain fact. I brought a sims pad to my gunsmith to put on a M70 and he told me what a PITA they were because they didn't look crisp and clean after being run thru the sander unless they were cold. I notice the difference between a Sims pad and the decelerator