Despite my best efforts, I have been unable to remove the bolt handle from my A400 20 gauge lite. Pushing the rotating head back and tugging. I have removed it on my 391 dozens of times. It is tight with 0 wiggle to it, The gun is new and isn't cycling properly. I am trying to disassemble and see if something is wrong underneath. The bolt handle only has a few thousandths between it and the receiver. Any ideas?