The Spike's Tactical M4 Multical forged upper receiver is a flat-top AR-15 upper machined from a mil-spec 7075-T6 aluminum forging. It fits standard AR-15 rifles and ships with the forward assist and ejection port door already installed, so you can go straight to barrel and handguard installation.

The flat-top receiver gives you a full Picatinny top rail for optics or backup iron sights. The finish is black. Because the forward assist and dust cover come installed, there are no small springs and roll pins to fight with on the bench.

Features:

• Machined from a mil-spec 7075-T6 forging
• Flat-top upper with Picatinny top rail
• Forward assist installed
• Ejection port door installed
• Black finish
• Fits AR-15 rifles

What you still need: barrel, barrel nut, handguard, gas system, bolt carrier group and charging handle. Confirm your barrel and handguard are AR-15 (small frame) pattern. Have headspace checked when you install a new barrel and bolt, and do a full function check before live fire.