Spike’s Tactical M4 Flat Top Upper Receiver is machined from a Mil-Spec 7075-T6 forging with a durable Type III hardcoat anodized finish. It features M4 feed ramps that are cut into the receiver before anodizing to avoid future reliability issues, laser engraved T-markings, and the Spike’s Spider logo. Includes a pre-installed forward assist and ejection port door cover.
Forward AssistAssembled with Forward Assist
Port DoorAssembled with Port Cover
Receiver Material7075-T6 Aluminum