+1-800-504-5897 Help Center Check Order Status
About Us Policies Reviews How To
Free Shipping & Free Returns*

FREE SHIPPING on Over 250,000 Products

Enjoy free shipping during the holidays! Shop now and get Free Value Shipping on most orders over $49 to the contiguous 48 states, DC and to all U.S. Military APO/FPO/DPO addresses.

Enjoy Our Extended FREE RETURNS

We want to ensure that making a return is as easy as possible! With our Hassle-Free, Extended Holiday Returns, eligible orders placed from November 12, 2025 on will benefit from an extended return deadline (January 13, 2026 or 30 days after receipt of your order - whichever is later). We'll even cover the cost of return shipping. Learn more about our Return Policy.

  • Entire Store
  • ...
  • Apparel & Footwear
  • Astronomy
  • Everything Else
  • Eyewear
  • Hunting Gear
  • Lab Equipment
  • Military Gear
  • Outdoor Gear
  • Photography Equipment
  • Police, EMS & Fire
  • Shooting
  • Sport Optics
  • Sports & Hobbies
TIP
Shopping Cart

Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver Up to 10% Off w/ Free S&H — 9 models

Special offer available for this product. Click here to see!
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, Urban, MXM-48124
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Black, MXM-47989
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, Urban, MXM-48124
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, Urban, MXM-48124
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, Urban, MXM-48124
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
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, Urban, MXM-48124
1 of 10 images
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, Urban, MXM-48124
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
2 of 10 images
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Black, MXM-47989
3 of 10 images
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Black, MXM-47989
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, Urban, MXM-48124
4 of 10 images
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, Urban, MXM-48124
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, Urban, MXM-48124
5 of 10 images
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, Urban, MXM-48124
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, Urban, MXM-48124
6 of 10 images
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, Urban, MXM-48124
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
7 of 10 images
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
8 of 10 images
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
9 of 10 images
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988
10 of 10 images
Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988

Tap Tap to Zoom

Government Export Restriction Government Export Restriction
Government Restriction Government Restriction
You May Also Like
Best Rated Magpul Industries PMAG GEN M3 AR-15 Rifle Magazine, .300 Blackout, 30 Round, Black, 1 Pack, Polymer, MAG800-BLK-30RD
Magpul Industries PMAG GEN M3 AR-15 Rifle Magazine, .300 Blackout, 30 Round, Black, 1 Pack, Polymer, MAG800-BLK-30RD
(33)
List: $15.95 $14.75 Save Up to $1.20
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI556BLK-30RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI556BLK-30RD
(42)
List: $17.95 $16.95 Save Up to $1.00
Best Rated Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI571BLK-30RD
Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI571BLK-30RD
(45)
List: $12.95 $11.95 Save Up to $1.00
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 20 Round, Black, 1 Pack, Polymer, MAG560BLK-20RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Rem/5.56x45mm NATO, 20 Round, Black, 1 Pack, Polymer, MAG560BLK-20RD
(18)
List: $14.95 $13.95 Save Up to $1.00
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Coyote Tan, 1 Pack, Polymer, MAG556-MCT-30RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Coyote Tan, 1 Pack, Polymer, MAG556-MCT-30RD
(42)
List: $17.95 $16.95 Save Up to $1.00
Best Rated Magpul Industries PMAG GEN M3 AR-15 Rifle Magazine, .300 Blackout, 20 Round, Black, 1 Pack, Polymer, MAG1182-BLK-20RD
Magpul Industries PMAG GEN M3 AR-15 Rifle Magazine, .300 Blackout, 20 Round, Black, 1 Pack, Polymer, MAG1182-BLK-20RD
(11)
List: $15.95 $14.95 Save Up to $1.00
Best Rated Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Remington, 40 Round, Black, 1 Pack, Polymer, MGMPI233BLK-40RD
Magpul Industries PMAG GEN M3 AR-15/M16/M4 Rifle Magazine, .223 Remington, 40 Round, Black, 1 Pack, Polymer, MGMPI233BLK-40RD
(10)
List: $22.95 $20.45 Save Up to 11%
Best Rated Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI570BLK-30RD
Magpul Industries PMAG GEN M2 MOE AR-15/M16/M4 Rifle Magazine w/Capacity Window, .223 Rem/5.56x45mm NATO, 30 Round, Black, 1 Pack, Polymer, MGMPI570BLK-30RD
(11)
List: $15.95 $14.95 Save Up to $1.00
Amend2 Mod-3 Magazine, AR-15/M4/M16, 7.62x35/.300 AAC Blackout, 30 Round, Black, 300MOD3BLK30-30RD
Amend2 Mod-3 Magazine, AR-15/M4/M16, 7.62x35/.300 AAC Blackout, 30 Round, Black, 300MOD3BLK30-30RD List: $24.97 $16.99 Save Up to 32%
Best Rated PMC Ammunition 556K X-Tac, 5.56x45mm NATO, 62 grain, Light Armor Piercing, Brass, Centerfire Rifle Ammo, 20, 5.56
PMC Ammunition 556K X-Tac, 5.56x45mm NATO, 62 grain, Light Armor Piercing, Brass, Centerfire Rifle Ammo, 20, 5.56
(103)
List: $14.99 $11.29 Save Up to 25%
Questions & Answers
Show In Stock Only
9 Models Available
Caliber
All
Barrel Twist Rate
All
Threads per Inch
All
Color
All
Search
Click to select this item for your bundle offer!

Buy Together and Save

As low as $1,264.49
You Save Up to 11%
Receive $25.11 OP Bucks

Product Info for Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver

The MDX510 upper receiver is compatible with your existing Mil-Spec lower and is packed with Maxim Defense quality. It comes with either our Mil-Spec bolt carrier group or SCW bolt carrier group for those using our SCW system. For those wanting a standard length short barrel, the 10.3 barrel of the MDX510 is your best choice. Like our other uppers, the MDX510 includes our HATEBRAKE for increased reliability, Radian Raptor charging handle, and Maxim Defense hand stopimage

Specifications for Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver:

Manufacturer: Maxim Defense Industries
Overall Length: 19.25 in
Barrel Length: 10.3 in
Gas System Length: Pistol Length
Muzzle Device: Hatebrake
Finish: Cerakote
Handguard Style: M-LOK w/ Top Picatinny Rail System
Gun Model: AR-15
Barrel Material: 4150 Chrome Moly Vanadium

Package Contents:

  • Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver

What firearm models does the manufacturer say Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver is compatible with?

The manufacturer says that Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver is compatible with AR-15

Maxim Defense Industries MDX 510 U.R.G. AR-15 10.3 inch Upper Receiver Orderable Models

List of Orderable Models

  • 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, MXM-47968 , MPN: MXM-47968 , UPC: 680017479688 , Code: MDI-URC-MDX510-MXM-47968
  • Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8x24, HATEBRAKE, Arid, MXM-48008 , MPN: MXM-48008 , UPC: 680017480080 , Code: MDI-URC-MDX510-MXM-48008
  • Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Urban, MXM-48125 , MPN: MXM-48125 , UPC: 680017481254 , Code: MDI-URC-MDX510-MXM-48125
  • Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Arid, MXM-47988 , MPN: MXM-47988 , UPC: 680017479886 , Code: MDI-URC-MDX510-MXM-47988
  • Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8x24, HATEBRAKE, Black, MXM-48009 , MPN: MXM-48009 , UPC: 680017480097 , Code: MDI-URC-MDX510-MXM-48009
  • Maxim Defense Industries MDX 510 U.R.G. AR-15 7.62x39mm 10.3 inch Upper Receiver, Pistol Length, 1-10 Twist, 5/8x24, HATEBRAKE, Urban, MXM-48126 , MPN: MXM-48126 , UPC: 680017481261 , Code: MDI-URC-MDX510-MXM-48126
  • Maxim Defense Industries MDX 510 U.R.G. AR-15 .300 AAC Blackout 10.3 inch Upper Receiver, Pistol Length, 1-8 Twist, 5/8x24, HATEBRAKE, Black, MXM-47989 , MPN: MXM-47989 , UPC: 680017479893 , Code: MDI-URC-MDX510-MXM-47989
  • 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, Black, MXM-47969 , MPN: MXM-47969 , UPC: 680017479695 , Code: MDI-URC-MDX510-MXM-47969
  • 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, Urban, MXM-48124 , MPN: MXM-48124 , UPC: 680017481247 , Code: MDI-URC-MDX510-MXM-48124
Compare (0)
1 item has been added
Add at least two items to compare