Maxim Defense Industries MDX 510 U.R.G. AR-15 5.56x45mm NATO 10.3 inch Upper Receiver Pistol Length 1-7 Twist 1/2x28 HATEBRAKE Arid
$1,255.50 at MidwayUSA · 2 stores
In stock
Maxim Defense Industries MDX 508 U.R.G. AR-15 5.56x45mm NATO 8.5 inch Upper Receiver Pistol Length 1-7 Twist 1/2x28 HATEBRAKE Black
Maxim Defense · Upper Receiver
No ratings yetBest price
$1,255.50at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- Maxim Defense Industries MDX 510 U.R.G. AR-15 5.56x45mm NATO 10… $1,255.50at MidwayUSA
- Maxim Defense Industries MDX 510 U.R.G. AR-15 5.56x45mm NATO 10… $1,255.50at MidwayUSA
- DDM4V7 16" 5.56mm NATO 1-7 MFR XS M-LOK Upper $1,244.00at Kentucky Gun Co
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $1,255.50Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
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Price history
Dashed line = out of stock. Tracking since Oct 15, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $1,255.50 | $1,255.50 | $1,255.50 |
Since Oct 15, 2026.
About this part
The Maxim Defense Industries MDX 508 U.R.G. AR-15 5.56x45mm NATO 8.5 inch Upper Receiver Pistol Length 1-7 Twist 1/2x28 HATEBRAKE Black is an 8.5" 5.56 / .223 upper receiver from Maxim Defense. One store lists it, OpticsPlanet at $1,255.50.
Fits and works with
- Caliber
- 5.56 / .223 · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Pistol · Handguards
- Muzzle thread
- 1/2x28 · Muzzle devices
- Barrel length
- 8.5" · Handguards
Specifications
- Manufacturer
- Maxim Defense
- Color
- Black
- Platform
- AR-15
- Caliber
- 5.56 mm NATO
From the manufacturer
Maxim Defense Industries MDX 508 U.R.G. AR-15 5.56x45mm NATO 8.5 inch Upper Receiver Pistol Length 1-7 Twist 1/2x28 HATEBRAKE Black. It features an 8.5 barrel making it ideal for close-quarters situations. The included HATEBRAKE increases reliability and is tucked under the 9.5 handguard. These upper receiver groups ship complete including a Maxim Defense Mil-Spec or SCW bolt carrier group Radian Raptor charging handle and Maxim Defense hand stop ready to shoot right out of the box Specifications for Maxim Defense Industries MDX 508 U.R.G. AR-15 8.5 inch Upper Receiver: Manufacturer: Maxim Defense Industries Overall Length: 17.5 in Barrel Length: 8.5 in Muzzle Device: Hatebrake Finish: Cerakote Handguard Style: M-LOK w/ Top Picatinny Rail System Gun Model: AR-15 Barrel Material: 4150 Chrome Moly Vanadium Features of Maxim Defense Industries MDX 508 U.R.G. AR-15 8.5 inch Upper Receiver 1. Increased reliability due to included HATEBRAKE 2. Armorer level adjustable gas block 3. M-slot compatible handguard 4. Military-grade materials 17-4 Stainless Steel 7075 and 6061 Aluminum 5. HK height rail for a more rigid upper receiver 6. Installs on any Mil-Spec lower receiver 7. Comes with Mil-Spec or PDX BCG Package Contents: Maxim Defense Industries MDX 508 U.R.G. AR-15 8.5 inch Upper Receiver What firearm models does the manufacturer say Maxim Defense Industries MDX 508 U.R.G. AR-15 8.5 inch Upper Receiver is compatible with? The manufacturer suggests that Maxim Defense Industries MDX 508 U.R.G. AR-15 8.5 inch Upper Receiver is compatible with AR-15Maxim Defense Industries MXM-47909: MDX 508 U.R.G. AR-15 5.56x45mm NATO 8.5 inch Upper Receiver Pistol Length 1-7 Twist 1/2x28 HATEBRAKE Black
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