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From Colt only the 1/7 RH Twist. There are many sources for AR WYLDE barrels.

Looks like its a 5.56 chamber only. I have a 223 wylde barrle rifle and the the accuracy benefit is marginal at best. I would not worry it will shoot 223 and 556 accurately! Happy shootin and good luck!

the chamber will be 5.56 NATO, but shoots .223 rem too.

It's not a true .223 Wylde chambering. It is chambered in 5.56mm NATO, which means it can safely shoot both the 5.56mm NATO round, as well as the .223 Remington round. However, in theory, the 5.56mm NATO chambering does not afford the maximum accuracy potential for the .223 Remington cartridge. I say in theory because my experience with this rifle has been that it shoots the .223 round very accurately, as long as I do my part. My best groups have been using Privi Partisan .223 75-grain JHP ammo. Using this ammo I shot better groups than with 5.56mm NATO with 55-grain FMJ rounds. Bottom line on the Colt LE 6920: with the 1:7 twist, this rifle has excellent accuracy potential right out the box. I wouldn't worry about it not being chambered in .223 Wylde. I don't think I would have been to shoot any tighter groups. The 1:7 twist has more to do with the accuracy potential than the Wylde chambering.

This model is not offered with a 223 Wylde barrel from the factory. This model will accept a 223 Wylde barrel but will require a number of other alterations in order to do so.