Originally Posted by Yankee2718
I don't own a gen 4, my buddy does, so I don't have direct experience with one other than working with his. Try running some +P ammo through it. The RSAs tend to be a bit on the heavy side. I think the most recent is the 04. If yours doesn't have it I think Glock will send it to you.
Thr +P helps to break in the RSA.
Wait, you have a FDE model. Aren't those only available as a Gen 3?
You can get most models offered in FDE in both Gen3 and Gen4. The G19 being one offered in both. Link below shows all FDE models and gens offered.