The Panzer Arms M4 SPEED PRO competition style semi-auto tactical shotgun with skeleton body is our Speed Variation of the Panzer M4 shotgun. Manufactured with a lightened bolt for rapid follow up shots. It is a reliable, durable inertia-driven semi-automatic shotgun. Made from 4140 steel with just a polymer coating to match the aluminum handguard. Includes 5rd magazine, choke tube set and muzzle brake.