Most standard front sight gas blocks are held onto the barrel by either tapered pins or by clamps. When planning your free-float project, take a close look at the type of gas system currently on your rifle. 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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