After reading many of the threads on the gen 4, I was a little nervous prior to going to the range today. This is my first Glock although I am a long time shooter. Of course I had to take it apart and mess with it right out of the box yesterday! lol I tend to over-oil but held back after seeing that and other suggestions. Already made the pre-emptive call to glock to get the 043 RSA; the 042 is in place, with the 336 ejector. I am happy to report that I had not one problem after firing 50 rounds of Magtech, and 50 rounds of Herters (both 115gr). The magazine required a surprising amount of force to load, and I don't think I will be fully loading 15 rounds anytime soon. All comments are welcome regarding upgrades to the extractor, ejector, etc., but so far so good! Glad to be part of this great forum!