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The Aero Precision M4E1 Builder Set includes a Stripped M4E1 Lower Receiver, a M4E1 Threaded Upper Receiver in Anodized Black with port door and forward assist installed, and a Free Float Handguard of Aero Precision's choosing. Built from 7075-T6 Aluminum, this set is designed to pair with mil-spec AR-15 parts. Includes: Stripped M4E1 Lower Receiver, Nylon tipped tensioning set screw, Threaded Bolt Catch Pin. Free Float Handguard is included with your choice of Aero Precision handguard. Finish is Cerakote - Custom Finish. Not available to ship to California, Illinois, Massachusetts, or Washington.
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A comprehensive overview of every major component in an AR-15 build—including what's inside bolt carrier groups and parts kits—organized by assembly for new builders.
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Guide
A neutral guide to component strategies for left-handed shooters, left-eye dominant right-handed shooters, and those managing eye/hand dominance mismatches. Covers ambi uppers, charging handles, gas system tuning, and real-world tradeoffs.
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