I've got a stag model 7 in 6.8. Love it but ammo isn't cheap such as the 223 or 7.62x39. It is a tack driver and easy on the recoil. In addition to a new upper you will have to change the bolt. Also a regular 223 magazine will not feed 6.8 bullets. If you wanting to change calibers for your gun consider a 300blackout. If I remember correctly they can use the same bolt and magazine, just need a barrel.
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