Originally Posted By: Driftin'

While it is true that the .243 cannot be had in the AR-15 package, it can be built on the AR-10 that is used for the .308. RRA offers a complete upper in .243, with the caveat that the barrel is a 10-twist. This will likely limit you to bullets less than 85 grains or so with the barrel throated accordingly.

I would have said more if at all.

I thought 10 twist was standard fare for .243 ?
Seems like my 6mm Rem was 9 twist.

12 twist was a fail for .244 except for short, light varmint pills.
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