Glock Springs and Spring Kits THE ULTIMATE SPRING KIT !!! 7 SPRINGS IN ONE KIT 5 DIFFERENT WEIGHTS OF FIRING PIN SPRINGS 4.0, 4.5, 5.0, 5.5, 6.0 LBS (MORE) Our policy is that all trigger work MUST be installed by a Glock Armorer or professional Glock Gunsmith. If you are not a skilled Glock Armorer, take it to someone who is.