Some Installation Tips:
– Make sure to install all your Magpul MOE Rail Extensions BEFORE putting on the barrel. The ones that come with the hand guard screw in fine from the outside.
– Put the hand guard on AFTER you tighten the muzzle compensator. The handguard messes with the contour of your upper block.
– Remember to tighten the handguard, 6 bolts, very tight, otherwise there will be a lot of wiggle on the handguard.