Blackout Defense Quantum Mark 2 AR-15 Upper and Handguard Set

The Quantum Mark 2 upper and handguard are a mated pair. You're well on your way to a better build. They are precision machined to achieve perfect alignment, giving a monolithic-like appearance. And with the alignment pins, you get a lot of the structural integrity as well. Upper Receiver The upper receiver is machined from Aerospace Grade Aluminum with enhanced walls for greater rigidity and structural integrity - all while keeping a low profile. It features two anti-rotation holes that align precisely with their handguard. During install, insert the two alignment pins, align the handguard, and tighten. What you're left with is a monolithic-like style and design with an extremely robust upper/handguard combination. The dust cover often goes unnoticed in an AR-15. Not to us. The dust cover is fully contained within the upper receiver. They don't rely on a C-clip to keep everything in place. Instead, the dust cover hinge pin is held in place by the barrel nut, ensuring nothing comes loo