Are you asking about rifles chambered for the .243 Winchester cartridge specifically (which would have to be built on the AR-10 platform rather than the AR-15 due to issues of cartridge length), or are you asking about rifles chambered for any cartridge firing a 6mm/.244" projectile (such as .243 WSSM, or 6x45mm, which can be made to work in the AR-15 platform)?
There are at least three companies out there building 243 Winchester Super Short Magnum (WSSM) on AR-15 lowers. My friend built up one with the this Olympic Upper from Midway and has been real happy with it without any feed issues.
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