Not that its a deal breaker for me anyway my PT1911 and SR1911 WORK JUST fine imo. But this issue comes up alot at my job and on many forums and thought maybe someone on this forum would know. Ive read dont know if true or not that Kimber and Colt plus other "top tier" 1911s use them. Fine with me just that every so often the ole timers at the range start talking smack about how sorry guns are made today. Who knows.