M4A1 with M203

M4A1 with M203 is an item. A full-auto assault rifle chambered for 5.56mm NATO Cartridge. It takes STANAG Magazine (30). It has an M203 grenade launcher under the barrel: sneak and fire to shoot it, sneak and reload to load a 40mm grenade.

Crafting

M4A1 BarrelAR-15 ReceiverM4A1 Bolt CarrierRifle Trigger Group
M4A1 with M203

One of each part, in its own slot.