Spike's Forged M4 Upper Receiver Assembly SFT50M4
Product Features & Specifications Spikes SFT50M4 Flat Top Stripped Upper Multi-Caliber 7075-T6 Aluminum Black Anodized Receiver for M4 Platform Spike's Tactical M4 flat top upper receiver is the same high quality M4 Mil-Spec upper used on their factory builds.This forged upper is constructed of
