Went to range for first time with both of these. When the FDE glocks came out, i wanted a gen 4 19, but was hesistant, because I owned a gen 4 19 last year at this time, and it had issues. Nonetheless, i needed an FDE, so I picked it up. Put 100 rounds through it and it was flawless. Not fte issues and no brass to the face. 50 rounds of 124 nato, and 50 115 Fed Champion. Im happy about that, because to me, the 19 is about the perfect glock... 100 rounds through the 23. No fte issues. I did take 2 casings to the head. Also, one was thrown up and went down the back of my shirt. Still impressed with the gun, but will monitor ejection pattern on this one more closely. I think i notice a slight reduction in recoil between gen 3 and the gen 4 23, which is nice.