Resolute Mk4 5.56 NATO Assembled Upper Rcvr 16.1" Bbl Black
$489.99 at OpticsPlanet · 5 stores
In stock Sale
AR-15 Workhorse Upper Receivers- No BCG Or Charging Handle - AR-15 Workhorse 16 Upper M-LOK 1-7 Twist 5.56 NATO
Battle Arms Development · Upper Receiver
No ratings yetBest price
$499.99at GunMag Warehouse
In stock checked Oct 1, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| GunMag Warehouse Best price | $499.99checked Oct 1, 2026 | In stock | Buy at GunMag Warehouse | |
| Brownells | $524.95checked Oct 1, 2026 | In stock | Buy at Brownells | |
| OpticsPlanet | $524.95Salechecked Oct 1, 2026 | In stock | Buy at OpticsPlanet | |
| Ammunition Depot | $524.95checked Oct 1, 2026 | In stock | Buy at Ammunition Depot | |
| Palmetto State Armory | $582.99checked Oct 1, 2026 | Check store | Buy at Palmetto State Armory |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Price history
Lowest in-stock price in the last 30 days: $499.99 at GunMag Warehouse. Dashed line = out of stock. Tracking since Sep 27, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | $524.95 | $524.95 | $524.95 |
| Brownells | $524.95 | $524.95 | $524.95 |
| GunMag Warehouse | $499.99 | $499.99 | $499.99 |
| OpticsPlanet | $524.95 | $524.95 | $524.95 |
| Palmetto State Armory | $582.99 | $582.99 | $582.99 |
Since Sep 27, 2026.
About this part
The AR-15 Workhorse Upper Receivers- No BCG Or Charging Handle - AR-15 Workhorse 16 Upper M-LOK 1-7 Twist 5.56 NATO is a 5.56 / .223 upper receiver from Battle Arms Development. It's sold by 5 stores (4 in stock), from $499.99 to $582.99. The lowest in-stock price in the last 30 days was $499.99 at GunMag Warehouse.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Specifications
- Manufacturer
- Battle Arms Development
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Available from Battle Arms Development, the WORKHORSEA(R) Upper Receiver available in both 10.5" and 16" options! These upper receiver sets do not come with a Charging Handle or Bolt Carrier Group to allow for user customization. Barrel Length: 10.5" and 16" Gas System: Carbine Barrel Profile: A2 Barrel Steel: 4150 Chrome-Moly Vanadium Barrel Finish: Nitride Chrome Lining: None Muzzle Thread: 1/2-28 Chamber: 5.56 NATO Twist Rate: 1:7 Barrel Extension: M4 Diameter at Gas Block: .750 Gas Block Type: Low-profile Muzzle Device: A2 Flash Hider Receiver Material: Forged 7075 T6 R Mfg: Battle Arms Development Inc.
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