Rock River Arms RRA 16" Midlength Complete A4 Upper .223 5.56 AR-15 (AR0375X)
AR15 barreled and headspaced complete upper receiver new with full factory warranty from RRA. This is the upper used in the 1 MOA accuracy rifles RRA builds. In stock now and ready for your lower. Ships directly to your door (no FFL required). Wylde chamber to safely handle .223 or 5.56 surplus.
ALL LOCAL AND STATE REGULATIONS APPLY. ENSURE YOU ARE AWARE OF ALL LOCAL ORDINANCES BEFORE ORDERING FOR YOUR BUILD. FLASH HIDER AND BAYONET LUG ARE PRESENT.
- 1:9 16" Chromoly Barrel Chambered for .223 & 5.56
- Phosphated Complete Semi Only Bolt Carrier Group BCG
- Charging Handle
- A2 Flash Hider
- Mid-length Gas System and Handguard
- A2 Front Sight & Sling Swivel
WMD NiB-X Bolt Carrier Group BCG M16 M4 Nickel Boron Available in Semi or Full Auto M16 Weight Style
Drop-In AR-15 BCGs to increase reliability and ease cleaning and maintenance.
· Bolt – Carpenter 158 case hardened, shot peened and magnetic particle inspected. Manufactured to Government drawings. Mil Spec gas rings. NiB-X coated (40% more wear resistant than Chrome).
· Extractor – Manufactured, heat treated, hardened, per Government drawings. Black extractor buffer and heavy duty spring. NiB-X coated.
· Firing Pin – Manufactured, heat treated, hardened, Chromed and certified per Government drawings.
· Carrier – M16 style carrier (heavy weight), 8620 material, heat treated and case hardened. Manufacturing tolerances on inside diameters tightly controlled. NiB-X coated for durability and ease of cleaning.
· Gas Key – Hardened to USGI Specifications and attached using grade 8 hardened fasteners. Permatex No. 3D Aviation Form a gasket Type III Sealing Compound per MIL-S-45180 used on assembly. NiB-X coated. Staked per military specifications.
· Cam pin – Manufactured, heat treated, hardened and certified per Government drawings. NiB-X Coated.