I use Glock (-) connectors in all my standard and large frame Glocks. All my carry Glocks, G19 Gen 4 and G43, have all OEM parts except for the Ghost EDGE connector in the G43s. I have put reduced power safety plunger springs in those Glock pistols I do not carry. I have also put increased power trigger springs in those Glock pistols I do not carry. I understand Stock Glock pistols use 5.5# striker springs in order to fire ammo from all over the world. I have tried a 5# WOLFF spring in a G17 Gen 4 (with a GLOCKTRIGGERS.COM Guardian trigger kit), so far so good. I have tried a 4.5# WOLFF spring in a G35, so far so good. I have not yet tried a 4# striker spring. I always fire ammo made in the USA. I have Ghost EDGE connectors in my G42 and G43 pistols.