Works, but needs slight modifications - Sylvan Arms AR-15 f/9mm Glock Conversion Block

Bought this for my 9mm ar build. It fits great, but the mags fit really tight. You have to file, along the bottom, for easer mag loading and unloading. I also ground out the inner part of the ar mag well, on lower receiver, the insert mag lock, pushes out, when inserting magazine, causing a bit of binding.