I've learned how fortunate I am to own older Glock pistols..............
I'm following the Gen4 threads with great interest. The G30 threads, too.
Gen1 (G17), Gen2 (G17, G19), Gen3 (G19, G21SF, G26, G39), Gen4 (G19)
Glock Advanced Armorer (AA), Glock Instructor Workshop (IW)
Remington 870, Benelli M1, Smith & Wesson 3000, Mossberg 500