A Glock 36 for me, had multiple FTF's every 50 rounds. I had a half a dozen people shoot it, including the local so called "Glock" expert at the range. Everyone had the same issue. Got rid of it, life is to short to deal with a defective weapon.
-Glocks: Gen 4 G17/G19x2; Gen 3 Zev Tech G17
-Sigs, HK, Walther, Springfield...etc, etc