The trick to install is this: - Magpul Industries MOE Carbine Length AR-15/M4 M-LOK Handguard

As with ALL drop in AR handguards theres a technique. Get a partner and have them stand the rifle vertical on its buttstock. Get a cheap handguard prying tool, i have them for as low as . $8. The grip with one hand on the pistol grip with their other hand prying down the Delta Ring. This gives you 2 hands free, one for each of the two handguard sections. Hold both pieces in a triangle/pyramid fashion and at the same time enter top(muzzle end) and meet them. The work down to the Delta Ring(receiver end). Be sure to orient your pieces the hand stop bump is the bottom. A partner with two strong hands could pull down the delta ring without a tool but they would wear out their hands quickly. I have done multiple drop ins( magpul, MFT, etc. Plastic and aluminum). This technique works. You cannot install one piece at a time.