I can't find a true left handed (not right handed with a deflector) AR10 type rifle, any suggestions? Also anyone have any experience with the 6.8 SPC compared to the .308? Stag is the only manufacturer that offers a big bore left hand, but it's 6.8 not the .308 that I want. all the other true leftys are 5.56/.223 and I already have one of those.