i have four glocks and never had a problem with any of them, however that is not your question. according to the internet the gen 4 g 19 problem stems from the recoil spring which glock has already addressed. i think the way to handle this would be to call glock in smyrna georgia and ask them which is the right spring for your gun, then compare that to what is in the gun at your dealers. they are suppose to have numbers on them and if you have the wrong one glock will send you one free as stated on the internet. hope this helps!