Chamber too tight - OpticsPlanet Exclusive L2D Combat Precision Match Fluted/Threaded Barrel, Glock 19

The chamber is too tight and about 5-10% of quality factory ammo wedges in and won't extract or go into battery. I've run about 300 rounds through, which is extremely time consuming with having to pry a live round out about once per magazine, naively thinking a break in period might help. I have one other l2d barrel that is fine. I wish I had put this barrel in and discovered it right away rather than letting it sit on my bench for months because I'd have returned it.