I have five or six Glocks in various guises. I have carried them and shot a metric boat load of ammo through them. I have been to the Glock factory armorer class and their instructor course. I love the simplicity of the design. It is modular, but for so many years, Glock refused to make changes.
Those days are gone.
There are a hundred companies with improved Glock parts for duty and competition. All the best stuff is at lonewolfdist.com/. Surf everything available on one site. The prices are fair and the service is good. They provide gunsmith services or parts to do it yourself.
Everything is there, from new triggers to competition parts and reduced weight slides..