If either half of the quadrail is still loose and the arched end isn't in full contact with that circular receiver.push it down into that Delta ring again and put mild pressure on the arched end until it snaps in place. The arch of the forward end of the quadrail will make contact with the circular receiver if you did it right. While others like the classic aesthetic and simplicity of a drop-in quad-rail type handguard. Many builders prefer maximum versatility, accuracy and comfort using a free-floated M-LOK rail. There is a lip inside the forward end of each half that will push up against that circular receiver. Handguard Length 6' 15' The handguard, also known as a rail is one of the most important parts of an AR-15 or AR-10 type rifle. If you pushed down hard enough, it should be locked perfectly OVER the forward receiver (your previous handguard was inside this circle). Then take the top half, insert the shaved end into the Delta ring (push on that muther) then the forward end down over the gas line. Once the current guards are out, take the 4 screws in this unit completely out and set them aside. This is a true "drop in" unit on the Anderson AM15 carbine version. Pay no attention to the oval opening when all 4 screw are tightened. This unit is slotted to be adjustable, and the opening will be circular when fit into the Delta Ring. I see a lot of folks complaining about the oval shape. But it is tough and should hold up to punishment!!! Adds some weight, give its all aluminum construction. This thing dropped into my Anderson AM15 Carbine like butter! Took all of 5 min to install (note, I am ex-military and experienced Delta Ring wrangler).
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