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Here's the better-than-mil-spec start you need for your next AR-10 build. The Aero Precision® M5 Barreled Upper features an 18" 4150 CMV steel barrel, low-profile gas block, and Aero's own Atlas R-One handguard.
Machined from 6061-T6 aluminum, the Atlas R-One is optimized for minimal size and weight, providing an ultra-slim profile without compromising strength and stability.