6mm Upper?



Get out of AR15 lower and buy an AR10 and go 243 Winchester.
You will have no problems with Magazines.
No problems with anything. If you can get away from the AR15 buy 6,8mm.
 
My 6DTI offers literally 90% of the ballistic performance of the mighty 243 but in a smaller AR15 platform vs big heavy AR10. And less powder, less recoil, less noise. No issues with PRI mags. Where 243 is sometimes "a little too much" for saving fur, the smaller 6mms seem to hit a sweet spot.

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Dirty Dog is spot on. The 6 DTI is a pleasure to shoot. I can't really tell a difference in recoil between it and my 223. And it's pushing a 55 gr nosler over 3600 fps. And if someone tries to say there isn't any good 6.8 brass, then they haven't tried s&b brass.
 
I chose a DTech 243 WSSM upper. The Shilen select match barrels are real shooters. You can load 95 gr Sierra MatchKing bullets to mag length and get over 3000fps, so it's still supersonic at 1000 yds. This is on an AR-15 platform too!
 
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