FosTech Complete LOW MASS Bolt Carrier Group - Nickel Boron

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.

Full Profile M16 Bolt Carrier Group — Low Mass Nickel Boron

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: 8.5 Ounces

• 100% USA Made