ATI Alpha Maxx Stripped Upper Lower Receiver Set

The ATI Alpha Maxx stripped receiver set gives you a lightweight, durable foundation for a build that performs. Both upper and lower are molded from reinforced polymer and engineered around ATI's patented over-molded metal inserts that reinforce pressure-bearing contact points - giving the feel and function of a reinforced receiver without the weight penalty. Designed as a true builder's starting point, the set ships stripped so you can install your choice of internals, barrel, and furniture while benefiting from ATI's unique durability features.Configuration: Stripped Upper & Lower Receiver Set (no internals)Material: Reinforced polymer receiver bodies with over-molded metal inserts at pressure/contact pointsPatents / Features: Patented over-molded metal inserts; patented hammer & trigger pin locking screwsCompatibility: Accepts standard AR-15 / mil-spec components (standard mil-spec trigger groups, stocks, buffers, handguards, and magazines) - verify part dimensions for aftermarket variationsReceiver Interface: Reinforced buffer-tube housing and takedown/pivot pin contact areas (metal-on-metal interface via over-molded inserts)