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...adjust to tighten the play between the upper and lower reciever to the point it is about gone which makes for more accuracy, especially on follow up shots.
Accuracy in the AR15 Platform has nothing to do with upper to lower fit.
Barrel to Receiver Fit (Proper Torque)
Bolt to Barrel Fit (Proper Headspace)
Barrel Twist
Bullet Weight
Chamber Type (5.56, .223, Wylde)
Those are the Main Accuracy Concerns
Accuracy in the AR15 Platform has nothing to do with upper to lower fit.
Billet is fine if from 6061 T6......they are basically stress free though so should never have an issue either way.Also, make sure your lower is made from 7075-T6 Aluminum.