Hi, quick query for the experts: on my Gen 3 G17 the slide seems to stick a little when trying to remove it. I "grip" it at the back to take the pressure off the spring and pull the slide back a few mm. With the other hand I pull down the two slide release lock thingys. Now the slide will move forward, but only about 10 or 15 mm then stops. To let the slide move completely off the frame I have to pull the trigger, then it'll come off. Is this normal?