Presma kangaroo series ar float handguard - Presma Kangaroo Series AR Style Free Float Handguard Quad Rail Mount

I would give the product 4 stars except for the rail to barrel nut attach screws to align properly the barrel nut must be under torqued (10 ft lbs) or over torqued (100 ft lbs).
Upper receiver (Spikes) has accepted other free float rail barrel nuts within the specified torque tolerance. A message regarding barrel nut torque sent to Presma via their web site has got un answered. I'm done with Chinese AR parts.