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
- AR-15 Lower Parts Kits
- AR-15 Buffers & Springs
- AR-15 Muzzle Devices
- M-LOK Accessories
- AR-15 Bolt Carrier Groups
- Charging Handles
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.
