Description

The WORKHORSE Complete 16" AR15/M4 upper receiver delivers dependable, mil-spec performance in a finished, ready-to-install package. This Black configuration ships complete with a full-auto rated bolt carrier group (BCG) and the RACK-15-C ambidextrous charging handle for fast, ergonomic manipulation. Built from forged 7075-T6 aluminum and finished for durability — ideal for duty, range, or build upgrades.

Specifications

SKU: WH-UR-16-BLK (replace with your SKU)
Barrel Length: 16.0 inches
Caliber / Chamber: 5.56 NATO / .223 Rem (confirm exact chamber)
Barrel Steel: 4150 Chrome-Moly Vanadium (nitride finish)
Twist Rate: 1:8 (standard — confirm if different)
Gas System: Mid-length (smooth recoil impulse & extended service life)
Barrel Profile: Government / SLM (confirm profile)
Muzzle Thread: 1/2x28 (common; confirm if different)
Receiver Material: Forged 7075-T6 Aluminum — M4 feed ramps
Handguard: Free-float M-LOK® handguard (length matched to barrel)
Bolt Carrier Group (Included): Full-auto rated BCG (MPI & inspection standards)
Charging Handle (Included): RACK-15-C Ambidextrous Charging Handle
Finish: Hardcoat anodized (black)
Overall Length (assembled): Varies by stock & lower — typical with standard buffer tube
Included: Upper receiver assembly, 16" barrel, full-auto rated BCG, RACK-15-C charging handle, free-float handguard, barrel nut & mounting hardware

Features

Complete, drop-in upper — ship ready for installation on any mil-spec AR-15/M4 lower
Full-auto rated BCG for highest durability and reliable cycling
RACK-15-C ambidextrous charging handle — rapid manipulation from either side
Mid-length gas system for reduced felt recoil and improved longevity
Free-float M-LOK® handguard for modular accessory mounting and improved accuracy
Durable black hardcoat anodized finish resists corrosion and wear

Compatibility

Fits all mil-spec AR-15/M4 lower receivers. Compatible with standard magazines and components rated for 5.56/.223. Ideal for patrol, duty, precision shooters, and general range use.

What’s in the Box

WORKHORSE® Forged 7075-T6 Upper Receiver (assembled)
16" Nitride Barrel (pre-installed)
Full-auto rated BCG
RACK-15-C Ambidextrous Charging Handle
Free-float M-LOK Handguard
Barrel nut, gas tube (if applicable), and mounting hardware

Notes & Options

Some internal specs (twist rate, exact chambering, handguard length) may vary by production run — confirm before ordering if you require exact tolerances or threading for muzzle devices.
Barrel threading and muzzle device options available on request (suppressor-ready builds require confirming thread pitch).

Legal & Safety

Purchaser is responsible for compliance with all federal, state, and local laws. An FFL may be required for transfer in some jurisdictions. If you plan to configure as an SBR, ensure proper NFA paperwork is filed.

WARNING – California Proposition 65: This product can expose you to chemicals including lead, known to the State of California to cause cancer and reproductive harm. For details visit www.P65Warnings.ca.gov.

Questions or custom options? Call 406-885-1743 or email sales@yourdomain.com. Need a variant without the BCG/charging handle or a different finish — tell us and we’ll create a separate SKU for upsells.