Wait for the panic to settle down and then look for a used AR-10B, the original model AR-10 from ArmaLite. The one that uses the modded M1A mags or GenII ArmaLite mags.
With a quality barrel these well out shoot any of the other rifles in this thread. Look at what is dominating service rifle now, the AR-10. My NM Garand shoots great, as does my NM M1A, but the Noveske barreled AR-10 out shoots them all.