I have a Windham 7.62x39 AR15, so I decided to measure it. It's marked 1/9 and it measured about 1/9.5. Just to verify that I wasn't doing something wrong, I decided to measure my 308Win chambered Colt 901SE. It's marked 1/12 and it measured 1/12. So, I'm pretty confident that at least my Colt CR6762 has a mismarked twist rate. Here are pictures of the twist. From top to bottom is the Colt CR6762, Windham 7.62x39 and Colt 901SE.
https://i.postimg.cc/CKqNrQm8/Colt-CR6762-twist.jpg
https://i.postimg.cc/RFxTkLDD/Windham-76239-twist.jpg
https://i.postimg.cc/3x61BTC7/Colt-901-SE-twist.jpg