I can honestly say I've not had any failures and the L119 A1 has had many thousands of BBs through it. Still on it's original nozzle. Does have RAtec parts in the trigger box , only fitted a couple of months ago, but tbf that was more about enjoying tinkering, the original parts were still working fine. It rarely gets used in full auto which may extend sear life. Both have Maple leaf rubbers and omega nubs fitted along with Crazy jet barrels and the A1 has an NPAS fitted. I've made up a long tool for adjusting the hop , but once set it rarely needs adjusting .