AO Precision Manufacturing

Discover the pinnacle of tactical performance with AO Precision's True Mil-Spec M4 Flattop Upper Receiver. Designed for unparalleled compatibility and reliability, this upper receiver is the ideal choice for custom AR-15 builds. FEATURES Mil-Spec 7075 T6 Aluminum: Crafted from durable 7075 T6 aircraft-grade aluminum for superior strength and lightweight handling. True Mil-Spec Dimensions: Precision machined to ensure a perfect fit with all mil-spec lower receivers and parts.

These premium 9310 Bolt carrier groups are manufactured by AO Precision to the highest standards of top tier manufacturers within the industry. AO makes these HPT / MPI BCG's for other Military contractor juggernauts, such as FN America. All bolts are rigorously inspected and are individually High Pressure Tested and then go through a Magnetic Particle Inspection. Mil Spec Bolt Enhanced 9310 Steel Shot Peened High Pressure Tested (HPT) Magnetic Particle Inspected (MPI) Mil Spec Carrier 8620 Aircraft Grade Steel Full Mass M-16 Mil Spec Extractor

This upper receiver build kit is comprised of the following items and comes with everything that you need to build out your upper. Be sure to select any of or dust cover options from the dropdown menu! Includes: AO Precision Complete M16 5.56 Phosphate Bolt Carrier Group AO Precision True Mil-Spec M4 Flat Top Upper Receiver - Stripped Standard M4 5.56 Charging Handle - 7075 Aluminum Component Features: AO Precision M16 5.56 Phosphate BCG Caliber: .223 / 5.56 / 300 Blackout Enhanced 9310 Steel (Bolt) Bolt is shot Peened and HPT/MPI 8620 Aircraft Grade Steel (Carrier)

These Military surplus 158 Bolt carrier groups are manufactured by AO Precision to the exacting standards of the US Military. AO makes these HPT / MPI BCG's for other Military contractor juggernauts, such as FN America. All bolts are rigorously inspected and are individually High Pressure Tested and then go through a Magnetic Particle Inspection. Mil Spec Bolt 158 Carpenter Steel Shot Peened High Pressure Tested (HPT) Magnetic Particle Inspected (MPI) Mil Spec Carrier 8620 Aircraft Grade Steel Full Mass M-16 Mil Spec Extractor

Description Right here is a True Mil-Spec BCG. Each and every bolt, test fired from the factory. This unit is for builders who prefer tried and true manufacturing and aggressive quality assurance testing over fancy coatings, proprietary profiles and laser engraved logos. AO Precision has provided BCGs to large military contractors such as FN America and large commercial retailers who re-brand and sell these at a considerable mark-up. You can now get these directly from AR15Discounts.com and save big! Bolt - Machined from Carpenter Technology No. 158 alloy. - Heat treated