Once you remove the trigger guard, the spring in the above photo is in plain sight. What I was suggesting is that once you have it where you can see it you can put your finger on the spring to hold it down (it's normally held down by the trigger guard) and then open and close the gate and see if you can see if it is rubbing on anything. Once you remove that spring, the gate just falls out of its hole in the frame. Once out you can check it for burrs, etc.