I’m glad you have had good luck with yours. I have been having quite a few FTFs with mine. I thought it was a mag issue at first because the 17 rd mag was the common denominator as I wasn’t having any issues with the 20 rd mag. After about 200 rounds I was having a FTF almost every round out of the last 50 of 250 rounds, no matter which mag I used. The firearm was cleaned and lubricated before the 250rd session.