Maxim Defense MDX 508 5.56 Mil-Spec Complete Upper - 8.5"

The 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 bolt carrier group, Radian Raptor charging handle, and Maxim Defense hand stop, ready to shoot right out of the box.

Features:

• Increased reliability due to included HATEBRAKE™
• Armorer level adjustable gas block
• M-slot compatible handguard
• Military-grade materials [17-4 Stainless Steel, 7075 and 6061 Aluminum]
• HK height rail for a more rigid upper receiver
• Installs on any Mil-Spec lower receiver
• Comes with Mil-Spec BCG

Specifications:

• Weight: 3 lbs 10 oz
• Barrel Length: 8.5”
• Calibers: 5.56 NATO