Link: http://www.aimsurplus.com/product.aspx?item=XSTU5050MLSDC&name= Tactical 14.5" Lightweight 5.56/.223 DynaComp Upper Receiver&groupid=55
Spike's Tactical Lightweight .223/5.56x45 caliber Complete Upper Receiver
assemblies for AR15/M16 type Rifles. These rifles feature a 14.5" Light
Weight barrel with permanently attached DynaComp muzzle break for 16" total
length. Perfect for a super light weight build! This is a COMPLETE Upper
receiver assembly, everything except a rear sight, and includes Spike's
Tactical Tungsten filled ST-T2 heavy recoil buffer and Magpul MOE heat
shield lined handguard.