I can see the benefit of lapping, or squaring the receiver to the barrel. If the barrel is pointing in a different direction to the scope then the size of the group [precision] will not be affected but the ability to predict and drive this group around the target [accuracy] will be. This is more noticeable the further the target is from the shooter.
I understand bedding to be an attempt to fix a sloppy fit between barrel and receiver by introducing more rigidity. Presumably, more rigidity will influence precision and in theory this makes sense. Whether bedding actually does improve precision in an AR is not universally agreed. In a bolt gun it is.
One is guaranteed to improve the guns performance while the other probably does, especially if the interface is sloppy. Or, you can get a tight fit to start with. I have tried gluing and it did not improve group sizes. Others however have found that it helps and swear by it.
I understand bedding to be an attempt to fix a sloppy fit between barrel and receiver by introducing more rigidity. Presumably, more rigidity will influence precision and in theory this makes sense. Whether bedding actually does improve precision in an AR is not universally agreed. In a bolt gun it is.
One is guaranteed to improve the guns performance while the other probably does, especially if the interface is sloppy. Or, you can get a tight fit to start with. I have tried gluing and it did not improve group sizes. Others however have found that it helps and swear by it.