https://midstatefirearms.com/product/18-ar-15-complete-upper-416r-stainless-fluted-223-wylde-18-microbest-bcg/

Product Overview

Our AR-15 Complete Upper delivers precision, reliability, and top-tier performance in a 18″ Midlength versatile package. Built around an 18″ 416R stainless steel fluted barrel chambered in .223 Wylde, this upper is engineered for accuracy — capable of 1 MOA or better with quality match ammunition.

Assembled and test-fired by our armorers at Mid State Firearms, this upper is ready to drop onto any standard AR-15 lower receiver for immediate range use.

Key Features

  • 18″ 416R Stainless Steel Fluted Barrel – Match-grade precision, reduced weight, and enhanced cooling without sacrificing rigidity.
  • .223 Wylde Chamber (1:8 Twist) – Compatible with .223 Remington and 5.56 NATO for reliable accuracy.
  • Mid-Length Gas System – Smooth cycling, softer recoil, and improved reliability in a shorter barrel configuration.
  • 15″ Hybrid Slant Front M-LOK Rail – Lightweight and fully compatible with M-LOK accessories.
  • Competition Muzzle Brake – Minimizes recoil and muzzle rise for faster follow-up shots; see our muzzle devices collection.
  • 7075-T6 Mil-Spec Aluminum Receiver – Type III hardcoat anodized black with M4 feed ramps for dependable feeding.
  • Microbest Full Chrome Bolt Carrier Group (BCG) – Premium reliability built to strict mil-spec standards (details below).
  • Extended Latch Charging Handle – Works smoothly even with optics installed; check out our charging handles selection.
  • .750″ Low-Profile Steel Gas Block – Secured for consistent, long-term performance.
  • Stainless Steel Mid-Length Gas Tube – Corrosion-resistant and durable.
  • 1/2×28 Threaded Muzzle – Compatible with a wide range of AR-15 muzzle devices.
  • Fully Assembled & Test-Fired – Ready to install and shoot.

Microbest Chrome Bolt Carrier Group – Premium Reliability

A robust AR-15 Bolt Carrier Group is critical to rifle reliability. Microbest produces some of the most trusted BCGs in the industry:

  • Carrier: 8620 steel, full-auto M16 profile, hard chrome finish for smooth cycling and corrosion resistance.
  • Bolt: Carpenter 158 steel, shot-peened, High Pressure Tested (HPT), Magnetic Particle Inspected (MPI).
  • Extractor: Phosphate finish with Sprinco spring and insert for reliable extraction.
  • Gas Key: 4130 steel with chrome coating, secured with OCKS (Optimized Carrier Key Screws) and properly staked.
  • Cam Pin & Firing Pin: 4140 steel with chrome finish for durability.
  • Built to mil-spec standards for long service life.

Specifications

Component Details
Barrel Length 18″
Barrel Material 416R Stainless Steel, Fluted
Barrel Twist Rate 1:8
Chamber .223 Wylde
Gas System Mid-Length
Rail 15″ Hybrid Slant Front M-LOK
Muzzle Device Competition Muzzle Brake
Receiver Material 7075-T6 Aluminum, Type III Hardcoat Anodized
Bolt Carrier Group Microbest Chrome BCG (HPT/MPI, OCKS screws)
Charging Handle Extended Latch
Gas Block .750″ Low-Profile Steel
Gas Tube Stainless Steel
Muzzle Threads 1/2×28
Feed Ramps M4
Accuracy Potential 1 MOA or better with quality ammo
Assembly Factory-Built, Test-Fired

Why Choose Mid State Firearms?

  • Precision Assembly: Hand-assembled by expert armorers.
  • Premium Components: Only top-tier, top-quality parts.
  • Performance Tested: Each upper is function-checked and live-fired.
  • Customer Support: Knowledgeable staff ready to assist.

Related Products & Upgrades

Compatibility

Fits all Mil-Spec AR-15 lower receivers. No FFL required — ships directly to your door.

What’s Included

  • Complete AR-15 Upper Receiver Assembly
  • Microbest Chrome Bolt Carrier Group
  • Extended Latch Charging Handle

Order now and get an 18″ Mid-Length Gas AR-15 Complete Upper with Microbest BCG that balances maneuverability with precision and reliability.