Originally Posted by SLT223

Not really. They eliminated the need for the 6 o’clock cut on the forcing cone by eliminating the gas bushing. Some late model 66 owners on this forum have complained about the cylinder hanging up due to fouling blasting back into ejector channel. That’s my only apprehension with this set because my range sessions are typically 300 to 400 rounds. Folks on this forum noted problems south of those figures.