I finally decided to shoot a DPMS Oracle LR-308 that I bought new several years ago for the very first time today. I have an AR Stoner 5 round magazine, the stock 10 round DPMS magazine and a Brownell 20 round magazine. I tried all three magazine and when I pull the trigger it sounds like the firing pin is doing its thing, but there is no dent in the primer; when this happens, it is all I can do to pull the charging handle back to extract the unfired round. With no magazine in the gun and when I manually install one bullet at at time, it fires every time. The charging handle seems to function normally except when I am trying to extract an unfired round that came from the magazine. I read through the 19 pages of discussion topics and I didn't see a topic that seemed to be the same as this. If anyone has run into this and can provide me with some guidance, I would very much appreciate it. Thanks.