Aero Precision's new M4E1 upper and lower receiver set is the perfect base for your next AR build! Designed to be as light weight as possible and machined from aerospace grade 7075-T6 aluminum forgings the new M4E1 set gives you the look and feel of billet with the strength of forged aluminum without increased weight and cost! from Ground Zero Precision (Product AERO-ASSEMBLED-M4E1-THREADED-SET-BLK)

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