So I bought one of those cheapie plastic magwells from topglock and I go to put it on and it just doesn't marry up correctly to the gun. The most obvious problem is the big dimple in front of the G22's factory magwell. I never noticed it before, but it leaves a big u shaped gap in the front between the factory magwell and the aftermarket extension. What am I doing wrong here? did I order for the wrong generation?, because the website didn't specify generations...and the pics of the more expensive metal ones don't appear to have anything to fill the gap either?