I just bought a gen 4 19 and ran 250 rounds thru it. 200 was wwb and. The other 50 was Tulammo from Walmart. The Tulammo shot better and felt stouter than wwb. I didn't get really good groups. I was shooting low and left. I have read on other forums it is trigger control, I am having a little trouble getting used to the feel of the Glock Trigger. I don't have this problem with any of my other pistols, but they are all mostly 1911. Big difference. If anyone has any pointers on learning the Glock trigger, please advise. This is my first Glock and I'm loving it so far. Got lucky and didn't have a single malfunction. Two brass flew by my face while I was shooting weak hand but that is it. It has the rsa stamped 0 3.