Maxim Defense MDX 510 300 Blk Mil-Spec Complete Upper - 10.3" Black

The MDX510 Complete Upper receiver is compatible with the existing Mil-Spec lower and is packed with Maxim Defense quality. The Mil-Spec bolt carrier group. The 10.3" barrel of the MDX510 is your best choice. 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 Specifications: Weight: 4 lbs 2 oz Barrel length: 10.3" Calibers: 300 BLK