hey guys, I have a new 510 .410 bore and i've shot about 25 rounds with it. My 9 yr old daughter who i bought the gun for can barely pump it and its hard for me too. i'm 6'3 and 250 lbs lol. I have every gun from saige 12 ga to 300 whisper. So i know my guns. This is just ridiculous. I'm no gunsmith tho. I've cleaned and oiled the gun numerous times with no luck. Any info would be appreciated. She's about to give up and go back to her .22 and I can't have that!!!