What do I need to install a free float quad rail handguard? A direct impingement AR-15 can never be truly “free-floated” due to the attachment of the gas block and gas tube, but the addition of a quad rail or other free float style handguard can help with accuracy and also provides a stable and convenient platform for attaching bipods, lights, grips and other accessories. The traditional AR-15 configuration has the sling mount attachment at the base of the front sight gas block, so moderate changes in sling tension can change the point of impact downrange.
One of the main benefits to free-floating an AR-15 is an increase in accuracy from reduced variability in the barrel harmonics due to sling tension.
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