Product Overview
Our AR-15 Complete Upper delivers precision, reliability, and top-tier performance right out of the box. Built around a 20″ 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 here at Mid State Firearms, this complete upper is ready to drop onto any standard AR-15 lower and head straight to the range.
Key Features
- 20″ 416R Stainless Steel Fluted Barrel – Match-grade precision, enhanced cooling, and reduced weight without sacrificing rigidity.
- .223 Wylde Chamber (1:8 Twist) – Safely fires both .223 Remington and 5.56 NATO while maintaining exceptional accuracy.
- Rifle-Length Gas System – Smooth cycling and reduced recoil for better control.
- 15″ Hybrid Slant Front M-LOK Rail – Lightweight, ergonomic, and fully compatible with M-LOK accessories.
- Competition Muzzle Brake – Significantly reduces recoil and muzzle rise for fast follow-up shots.
- 7075-T6 Mil-Spec Aluminum Receiver – Type III hardcoat anodized black with M4 feed ramps for consistent feeding.
- Microbest Full Chrome Bolt Carrier Group – One of the most trusted BCGs on the market, built to strict mil-spec standards (details below).
- Extended Latch Charging Handle – Makes charging easy, even with large optics installed.
- .750″ Low-Profile Steel Gas Block – Secured for reliable long-term performance.
- Stainless Steel Rifle Gas Tube – Corrosion-resistant for extended service life.
- 1/2×28 Threaded Muzzle – Ready for most muzzle devices and suppressors.
- Fully Assembled & Test-Fired – Zero guesswork—install and shoot.
Microbest Chrome Bolt Carrier Group – Premium Reliability
A solid Bolt Carrier Group (BCG) is the heart of your AR-15’s reliability, and Microbest produces some of the best in the industry for military contracts and top-tier rifle builders. This BCG is built from the ground up for dependable service:
- Carrier: 8620 steel, full-auto M16 profile, full hard chrome exterior for corrosion resistance and smooth operation.
- Bolt: Carpenter 158 steel, shot-peened, High Pressure Tested (HPT), Magnetic Particle Inspected (MPI) for structural integrity.
- Extractor: Phosphate finish for optimal grip on case rims, Sprinco extractor spring and insert for consistent extraction.
- Gas Key: 4130 steel, chrome coated, secured with OCKS (Optimized Carrier Key Screws) and properly staked for maximum durability.
- Cam Pin & Firing Pin: 4140 steel with chrome finish for wear resistance.
- Built to true mil-spec standards for long service life.
Specifications
| Component | Details |
|---|---|
| Barrel Length | 20″ |
| Barrel Material | 416R Stainless Steel, Fluted |
| Barrel Twist Rate | 1:8 |
| Chamber | .223 Wylde |
| Gas System | Rifle-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 Buy from Mid State Firearms?
- Expert assembly by experienced armorers.
- Top-tier parts from trusted manufacturers.
- Every upper is function tested and live-fired before shipping.
- Knowledgeable support staff to answer build questions.
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 experience the accuracy, reliability, and performance trusted by serious shooters nationwide.
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sound of freedom – This was a great set up. I loved being able to customize the set up. Only issue I had was my own fault as a newb to building these. I used a heavy barrel in a slim hand guard. It makes adding attachments tough with clearances. Hoping someday to also get an AR10 from here.