Lower parts kit, it was worth the wait - Polymer80 PF-Series Pistol Frame Parts Kit With Trigger Compatible

Each lower parts kit can be installed multiple glock models. I know it can do the 17s and 19s and I think the sub compacts. Even comes with curved or straight triggers. Hate to say this, but you are going to have to put the trigger on to the trigger bar. There’s a couple of small pins for that but like I said earlier you have a choise of triggers.