I am down to 2 Glocks, a Gen. 3 Model 19 and a Gen. 4 Model 21. I bought the Model 21 used so it did not have all those replacement panels you can fit to adjust to your hands but seems fine in my hand, got 3 mags and a savings of $100.00 on a gun that looked totally new. The big difference is that my Gen. 3 has a drop in recoil buffer and the Gen. 4 has a duel spring setup, cannot put in a recoil buffer.
The other difference is I always put in one of those sheet metal trigger connectors to reduce the trigger pull weight, helped on my Gen. 3 and other gen. 3 Glocks I owned in the past, had no effect on my Gen. 4, trigger still has factory weight.
