Hello fellow glockers. I am seeking advice regarding an issue with my g42 and its inability to chamber HP rounds. The issue causes the nose of the round to jam into the feed ramp and the slide to lock back. It happens with every round in the magazine (i.e. Not just the first round from a fully loaded magazine). The type of ammo is Gold Dot 90g HP. The only mods to the gun are TFO sights, grip, and Pierce +1 mag ext. Before the mag mods I have fired a little over 3000 rounds (all Spear or American Eagle FMJ) and after the mag mods I have fired over 2500 rounds of the same. I have literally not had a single FTF or FTE with over 5000 FMJ rounds but I recently bought several boxes of Gold Dot HP for defense rounds and the first time I go to chamber it I have had issues. I have not attempted to take this to the range with HPs as I feel it would just be frustrating and a waste of time knowing I cannot even chamber a round. I have been recommended by several LEOs to polish the feed ramp but I have read mixed reviews on this. I have tried cleaning it extensively and have left it sit for weeks with the slide locked back as per recommendations on the many other threads that exist regarding similar issues. Does anyone have other suggestions that I can take so I can reliable feed defense HP rounds? I absolutely love this gun but do not want to be limited to FMJs for defense carry.