No. All it does is adjust the amount of gas running through the system to make it cycle properly. I've heard lots of BS on the internet about how it does, but there's physically no way a gas block adds or detracts from a rifle's accuracy, unless it's rubbing against something it's not supposed to be, and changes the barrel's harmonics.Will adjustable gas block improve accuracy im not an ar expert.
None of mine run an adjustable gas block, and that includes a 16" carbine-length gas system .300 BLK that cycles subsonics just fine, even without a suppressor on it. Some might call that a unicorn, but a proper-built rifle (high-quality parts and barrel) with a properly sized gas port makes a world of difference.