I purchased a new G19 from a dealer and when I took it to the range and fired, I experienced a large number of malfunctions. I was using Remington UMC 115 grain rounds and had 54 of 250 malfunctions. I sent the gun back to GLOCK, they fired 50 rounds thru it (115g) and said they couldn't reproduce the problem. I've read a few threads here and locked the slide back and will leave it for a few days. I'm interested to know about possible remedies, known issues and should I just consider a higher grain bullet. Thanks in advance.