NOT KNOWN DETAILS ABOUT GLOCK 30 GEN 4

I set a Tarran Tactical package into a gen 3 g23 and It really is now super lite but I continue to could not strike anything at all with it. My friend could shoot it rather well but I struggled. Ultimately I changed the inventory sights to the Dawson Precision Set Opposition Sight Set and now I do very good with it.Maybe a dumb problem, but could b