I bought a DPMS Panther myself after Finding one I liked but also THOUGHT I could upgrade myself and do what I want to it BUT I bought a tapco stock wrench off of C*(*^#$ T&$* D*%! and an MAGPUL ASAP for it. When I tried to loosen the castle nut my wrench wouldn't budge it....So i put a little more pressure on the nut and the wrench started to dig into my threads, I stopped there and took it to a gunsmith who told me that I ruined the threads and he would try. After about 20 min he came back with a broken tool and a bent tool and said It's not moving and that he would have to cut the buffer tube and remove the threads a different way, Quoted me 80 for the new Free float hand guard I want put on and 70 to remove the old stock and put a new one on. So total I would have to pay $230 for everything due to having to by a whole new stock set!!! I paid $800 for the rifle and I would be up to $1030 total. My question is has anyone else had this problem with their AR and What did I do wrong? Honestly I didn't think I was going to have this whole dilemma when I started otherwise i would have just taken it to a gunsmith. My Advice is take anything you have to a gunsmith before trying to DIY with a gun.