Resolute Mk4 300BLK Assembl Upper 14.5"bbl W/P&W Brake BLK
$519.99 at OpticsPlanet · 3 stores
In stock Sale
Best price
$452.49at Ammunition Depot
In stock Lowest in 30 dayschecked Oct 30, 2026
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| Ammunition Depot Best price | $452.49checked Oct 30, 2026 | In stock | Buy at Ammunition Depot | |
| OpticsPlanet | $519.99Salechecked Nov 10, 2026 | In stock | Buy at OpticsPlanet | |
| GunMag Warehouse | $609.99checked Oct 29, 2026 | In stock | Buy at GunMag Warehouse | |
| Palmetto State Armory | $574.99checked Nov 10, 2026 | Check store | Buy at Palmetto State Armory | |
| Brownells | $595.38checked Nov 10, 2026 | Out of stock | Buy at Brownells |
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: $452.49 at Ammunition Depot. Dashed line = out of stock. Tracking since Sep 28, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| Ammunition Depot | — | $452.49 | $452.49 |
| Brownells | $595.38 | $595.38 | $595.38 |
| GunMag Warehouse | — | $609.99 | $609.99 |
| OpticsPlanet | $519.99 | $479.99 | $519.99 |
| Palmetto State Armory | $574.99 | $514.99 | $574.99 |
Since Sep 28, 2026.
About this part
The Resolute Mk4 300BLK Assembled Upper Rcvr 16.1" Bbl Black is an AR-15 complete upper receiver from CMMG. It's sold by 5 stores (3 in stock), from $452.49 to $609.99. The lowest in-stock price in the last 30 days was $452.49 at Ammunition Depot.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Barrel length
- 16.1" · Handguards
Specifications
- Manufacturer
- CMMG
- Color
- Black
- Type
- Complete
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
CMMG RESOLUTEA(R) MK4 300 BLACKOUT ASSEMBLED UPPER RECEIVER Top off your next build with this RESOLUTEA(R) Mk4 Upper Group. Chambered in 300BLK, this upper group is a staple for any collection. This upper group does NOT include BCG or charging handle. SPECS Platform: Mk4 Caliber: 300BLK Operating System: Direct Impingement Barrel Length: 16.1" Barrel Twist: 1:7 Barrel Contour: MT Barrel Material: 4140CM, SBN Muzzle Device: CMMG A2 Flash Hider Muzzle Thread: 1/2 x 28 Gas Port Location: Mid Gas Block: Non-Adjustable 0.750" Upper Receiver: Billet 6061 T6 Alumin Mfg: Cmmg
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