I have been running a Vista Short with both major and minor loads for more than a year. I changed the extractor, ejector and firing pin and have shot 8-10k rounds with very few issues. I ran some 130pf loads thru it today to check POI before a 3 gun match this weekend. When I shoot USPSA I run 170pf JHP's. The gun is still very tight and smooth. I put a Holosun 510C with an Atlas mount and it has been rock solid.