Eemann Tech Upgrade Kit for Glock GEN 4 (ET-120019) The Eemann Tech Upgrade Kit for GLOCK GEN4 Small Frame allows you to lighten the trigger pull weight of your GLOCK and extend the magazine catch that allows to reduce the time of magazines reloading. The GLOCK trigger pull weight is determined springs weight and GLOCK OEM connector 4,5 lbs. (2.0 kg).