At the end of the day the Glock has several things going against it for real accuracy - it is polymer framed, which allows more flex; it has itty bitty frame rails; it locks up loose as a goose.
One of the simplest was to tighten groups with a stock barrel might be to tighten the lock up by using a slightly oversized 'match' slide lock: https://www.kingglock.com/Detail.aspx?PROD=799507
An aftermarket barrel for Gens 1-4, is going to also help, even a direct drop-in with no fitting in my limited experience.
That being said, 3 inches at 25 is doable with decent ammo and practice.
Patriotism means to stand by the country. It does not mean to stand by the President... - Theodore Roosevelt, Lincoln and Free Speech, Metropolitan Magazine, Volume 47, Number 6, May 1918.
Every Communist must grasp the truth. Political power grows out of the barrel of a gun. Our principle is that the Party commands the gun, and the gun must never be allowed to command the Party Mao Zedong, 6 November, 1938 - speech to the Communist Patry of China's sixth Central Committee
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