Well, the Primary Arms 1-6X scope I put on my AR-10 gave up the ghost recently. It's been acting weird for quite a while, but just today I had pretty solid proof that it was way off - I'm no Carlos Hathcock, but I was shooting WAY better than the 6-7 MOA my rifle was giving me. My mount was solid, and my ammo was crazy consistent (My 10-shot SD was in single digits, which hardly ever happens). I've called PA, and they sent me an RMA. I'm sending it in, and I'm hoping they'll repair or replace it, or I just blew $270. It's been a good scope so far, and I'm hoping this is just a fluke. Fingers crossed. I spent all summer dialing in some ammo to match the BDC, and I really don't want the 200 rounds of premium quality ammo to go to waste.