Munitionworks M4P Bolt Carrier Group

Munitionworks M4P Bolt Carrier Group

Bolt Head: Carpenter No.158 Alloy; Individually High Pressure Tested and Magnetic Particle Inspected ("MP" Marked); Shot Peened; Batch marking and unique QC identification number

Extractor: Cold-Drawn 4340 Alloy; Shot Peened; Sprinco XP-5 Enhanced Extractor Spring and Mil-Spec Rubber Spring Insert

Ejector: S7 Tool Steel; Shot Peened; Sprinco Enhanced Ejector Spring

Carrier: 8620 Steel; Full Mass, M16-Profile

Gas Key: Extruded 4340 Alloy; Sealed with Permatex Form-A-gasket #3; Staked Grade-8 Fasteners

Firing Pin: 8740 Alloy Steel; Shot Peened; Hard Chrome Plating

Cam Pin: 4340 Alloy Steel; Engraved " FORWARD" Directional Indicator

Caliber: 5.56 NATO

Finish: Hard Chrome Plating

Quality Control: Marked with batch and individual ID; Carrier assembly pressure-tested for gas flow efficiency; Bolt heads individually checked for head space

100% MADE IN THE USA: Assembled by hand in Oostburg, WI from exclusively American-made components