Warning double burst - Overwatch Precision TAC Glock Trigger

Installed this on psa dagger fullsize. Dry fired and felt good. Took it to the range and was surprised by a two shot burst. Went back to the bench to check the install all looked good. Nope double burst again. A bit scary. Very disapointed because I liked the feel and travel of shoe. Salvaged the deal by knocking the pin out of the shoe and swapped out the oem dagger shoe. Works like a charm. My armorer friend advised when trying out a new trigger never have more than 2 or 3 rnds in the mag. Now I know why.