Midwest Industries AR-15 Bolt Carrier Group 5.56x45mm Black Nitride

The Midwest Industries AR-15 Bolt Carrier Group is a replacement bolt carrier assembly for AR-15 and M16 platform rifles chambered in 5.56x45mm NATO or .223 Remington. It locks the bolt into the chamber, extracts spent cases and cycles the action as the rifle fires.

The carrier is made from C158 Carpenter Steel and finished in black nitride for a black, corrosion-resistant surface. The raw text describes the bar stock as 4140 steel, which conflicts with the listed C158 material, so the structured material spec is used here. The assembly includes an extractor insert and an O-ring.

The group is listed as fitting AR-15 and M16 rifles in these calibers. Confirm the bolt and carrier match your receiver and barrel configuration before installing.

• Brand: Midwest Industries
• Model: AR-15 BCG
• Type: Bolt carrier group
• Fits: AR-15/M16
• Calibers: 223 Remington, 5.56x45mm NATO
• Material: C158 Carpenter Steel
• Finish: Black Nitride
• Color: Black