This is a standard full-auto M16 cut bolt carrier group. It is designed to function with the Echo AR-II and the Echo Sport.

Bolt Assembly

• Bolt: Shot Peened; Magnetic Particle Inspected and Marked
• Bolt Material: 9310 Alloy Steel
• Compatibility: .223 / 5,56 / 300BLK
• Extractor: Shot Peened Hardened Tool Steel
• Extractor O-Ring: Viton, Mil-Spec
• Gas Rings (3): Mil-Spec
• Finish: BLACK NITRIDE

Bolt Carrier

• Material: 8620 Steel
• Design: Heavy Profile M16 Style
• (Preferred for most AR-15 Builds)
• Gas Key Screws: Grade 8; Properly Torqued and Staked to Mil-Spec
• Gas Key Material: 4130 Steel
• Finish: BLACK NITRIDE

Cam Pin

• Material: 4140 Steel
• Finish: BLACK NITRIDE

Firing Pin

• Material: 8740 Steel; Centererless Ground; Hard Chrome Plated
• Weight: 11.6 Ounces

Bolt Assembly 

• Bolt: Shot Peened; Magnetic Particle
• Inspected and Marked
• Bolt Material:  9310 Alloy Steel
• Compatibility: .223 / .556 / 300BLK
• Extractor: Shot Peened Hardened tool Steel Extractor 0-Ring: Viton, Mil-Spec
• Gas Rings (3): Mil-Spec
• Finish: NICKEL BORON

Bolt Carrier 

• Material: 8620 Steel
• Design: Heavy Profile M16 Style
• (Preferred for most AR-15 Builds)
• Gas Key Screws: Grade 8; Properly Torqued and Staked to Mil-Spec
• Finish: NICKEL BORON

Cam Pin: 

• Material: 4140 Steel
• Finish: NICKEL BORON

Firing Pin

• Material: 8740 Steel; Centerless ground; Hard Chrome Plated
• Weight: 11.6 Ounces

100% USA Made