In Stock
Type
parts
Last Seen
May 20, 2026
Maxim Defense MDX 508 AR-15 Complete Upper Receiver 300 AAC Blackout 8.5" Barrel Black
Sold byMidwayUSA•Posted Apr 27, 2026
Compare prices for Maxim Defense MDX 508 AR-15 Complete Upper Receiver 300 AAC Blackout 8.5" Barrel Black$1,255.50
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Deal Summary
- Currently in stock.
- Category: parts
- UPC: 680017479299
- SKU: 603995
- Brand: Maxim Defense
Price History
Deal Details
The Maxim Defense MDX508 upper receiver is now available as a direct upgrade to your existing Mil-Spec lower receiver. 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. FeaturesIncreased re
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Lowest Price: $1,255.50
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Maxim Defense MDX 508 AR-15 Complete Upper Receiver 300 AAC Blackout 8.5" Barrel Black
Maxim DefenseMidwayUSASKU/UPC: 603995
$1,255.50
View at MidwayUSA
Maxim Defense Industries MDX 508 U.R.G. AR-15 .300 AAC Blackout 8.5 inch Upper Receiver Pistol Length 1-7 Twist 5/8x24 HATEBRAKE Black
Maxim Defense IndustriesOptics PlanetSKU/UPC: MDI-URC-MDX508-MXM-47929
$1,255.50$1,395.00Save 10%
View at Optics Planet