Hi mate I have the exact pistol & had the same thing 👍 take out the inner barrel & hop & turn the hop to full 👍 then look down it & you will see it's not square 🙁 you will need to strip the hop & just tweak the hop arm with a pair of pliers a little at a time 👍 but be careful not to bend it too hard or you will break it 👍 Hope this helps M8 👍