How To Install A Free Float Quad Rail
Few things will make your AR-15 more accurate like a free float rail will. We have all the best brands in stock at the cheapest prices just for you! Mar 18, 2016 - Installing a new free float quad rail or handguard on your new AR-15 build? Be sure to check out our handy checklist of all the necessary tools.
Why install a free float handguard? 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. 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. 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.
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What do I need to install a free float quad rail handguard? When planning your free-float project, take a close look at the type of gas system currently on your rifle. Most standard front sight gas blocks are held onto the barrel by either tapered pins or by clamps. Step-by-Step Installation As always, before working on any firearm make sure it’s unloaded and safe to handle. First, remove the original handguards using a handguard removal tool. Separate the upper and lower receivers and remove the bolt carrier group and charging handle.
Clamp the upper receiver into a vise using a vise block and remove the flash hider and crush washer. The crush washer will not be reused. Tap out the gas tube roll pin with a #2 roll pin punch and inspect the front sight gas block. If it has tapered pins, drive them out with a cup tip punch from the small side. If unsure, measure the pin diameter on each side first. If the pins are difficult to remove, apply penetrating oil, let sit overnight and try again.
Sometimes applying light heat to the area also helps with removal. If the gas block is a clamp-on type, use a hex key to loosen the set screws. Remove the original front sight gas block assembly from the barrel. If it sticks, gently tap on it with a soft-faced hammer until it slides off the barrel. Remove the handguard retainer and gas tube.
On a bench block, align the gas tube through-hole (with the large hole facing down) into the new gas block and use a roll pin holder to start the roll pin. Drive the roll pin flush with the gas block.
Remove the original barrel nut/delta ring assembly with the armorer’s wrench, then clean and inspect the upper receiver threads. Remove the anti-rotation screw from the bottom of the new handguards and unscrew the new barrel nut, removing it from the handguards. Apply a thin layer of high quality lithium moly grease to the inside threads of the barrel nut, install it over the barrel so that the lock ring faces toward the upper receiver, then hand-tighten the barrel nut. Set your torque wrench to 30 ft/lbs and tighten the barrel nut using your armorer’s wrench. Remove the torque wrench and loosen the barrel nut with the armorer’s wrench (never loosen with a torque wrench). Re-torque to 30 ft/lbs, then remove the torque wrench and loosen again. Torque to 30 ft/lbs one more time and inspect the alignment between the barrel nut hole and the gas tube hole in the upper receiver.