I have three Glock 21 Gen 4's, and they are my mainstay (one for carry, one for training/beating, one for backup for the other two). I like to have a complete array of replacement parts just in case I need them one day, especially in the event Glock discontinues the Gen 4 in .45 one day like they did with 9mm and .40. However, I can only find complete parts kits for the slide and frame for the G21SF Gen 3.
Do I just need to compile a list of all the parts for Gen 4 G21's and buy them piecemeal?
Do I just need to compile a list of all the parts for Gen 4 G21's and buy them piecemeal?