Perhaps you're not familiar with the term "primary extraction". Primary extraction is a mechanical feature that retracts the bolt a short distance when the bolt is rotated to the end of it's radial travel. This is accomplished with a cam that is cut on the bolt handle and a mating surface inside the receiver. When the cams meet, it causes the bolt to move rearward about .050", popping the case loose from the chamber, with mechanical advantage.
If there excessive clearance between the cams, they will not engage each other.