I may be out of line and/or have no dog in this fight.... But.... I don't think it's right or fair to condemn and chastise a parts manufacturer and distributor for a problem that may or may not be their fault...... Seems to me that if there were a problem with the triggers, we would have heard about them by now ?? In all fairness, you should have someone else check it for you..
The notation on the trigger packaging states, "This product should be installed by a competent gunsmith".